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-rw-r--r--net/alcoholic_jwt/.gitignore4
-rw-r--r--net/alcoholic_jwt/Cargo.lock192
-rw-r--r--net/alcoholic_jwt/Cargo.toml16
-rw-r--r--net/alcoholic_jwt/LICENSE674
-rw-r--r--net/alcoholic_jwt/README.md62
-rw-r--r--net/alcoholic_jwt/default.nix9
-rw-r--r--net/alcoholic_jwt/src/lib.rs465
-rw-r--r--net/alcoholic_jwt/src/tests.rs61
-rw-r--r--net/crimp/.gitignore3
-rw-r--r--net/crimp/Cargo.lock178
-rw-r--r--net/crimp/Cargo.toml18
-rw-r--r--net/crimp/LICENSE674
-rw-r--r--net/crimp/README.md15
-rw-r--r--net/crimp/default.nix9
-rw-r--r--net/crimp/src/lib.rs502
-rw-r--r--net/crimp/src/tests.rs152
-rw-r--r--net/stomp_erl/.gitignore10
-rw-r--r--net/stomp_erl/Makefile8
-rw-r--r--net/stomp_erl/README.md78
-rw-r--r--net/stomp_erl/include/stomp.hrl22
-rw-r--r--net/stomp_erl/src/stomp.app.src7
-rw-r--r--net/stomp_erl/src/stomp_app.erl11
-rw-r--r--net/stomp_erl/src/stomp_sup.erl22
-rw-r--r--net/stomp_erl/src/stomp_worker.erl193
24 files changed, 3385 insertions, 0 deletions
diff --git a/net/alcoholic_jwt/.gitignore b/net/alcoholic_jwt/.gitignore
new file mode 100644
index 000000000000..143b1ca01474
--- /dev/null
+++ b/net/alcoholic_jwt/.gitignore
@@ -0,0 +1,4 @@
+
+/target/
+**/*.rs.bk
+Cargo.lock
diff --git a/net/alcoholic_jwt/Cargo.lock b/net/alcoholic_jwt/Cargo.lock
new file mode 100644
index 000000000000..4f541cd8acc7
--- /dev/null
+++ b/net/alcoholic_jwt/Cargo.lock
@@ -0,0 +1,192 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "alcoholic_jwt"
+version = "1.0.1"
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+ "openssl",
+ "serde",
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+]
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+ "libc",
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+ "openssl-sys",
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diff --git a/net/alcoholic_jwt/Cargo.toml b/net/alcoholic_jwt/Cargo.toml
new file mode 100644
index 000000000000..4430e0687978
--- /dev/null
+++ b/net/alcoholic_jwt/Cargo.toml
@@ -0,0 +1,16 @@
+[package]
+name = "alcoholic_jwt"
+description = "Library for validation of RS256 JWTs"
+version = "1.0.1"
+authors = ["Vincent Ambo <mail@tazj.in>"]
+keywords = ["jwt", "token", "jwks"]
+categories = ["authentication"]
+license = "GPL-3.0-or-later"
+repository = "https://code.tvl.fyi/tree/net/alcoholic_jwt"
+
+[dependencies]
+base64 = "0.10"
+openssl = "0.10"
+serde = "1.0"
+serde_derive = "1.0"
+serde_json = "1.0"
diff --git a/net/alcoholic_jwt/LICENSE b/net/alcoholic_jwt/LICENSE
new file mode 100644
index 000000000000..94a9ed024d38
--- /dev/null
+++ b/net/alcoholic_jwt/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
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+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
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+  The licenses for most software and other practical works are designed
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+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
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+may consider it more useful to permit linking proprietary applications with
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+<http://www.gnu.org/philosophy/why-not-lgpl.html>.
diff --git a/net/alcoholic_jwt/README.md b/net/alcoholic_jwt/README.md
new file mode 100644
index 000000000000..b9ff57df4be3
--- /dev/null
+++ b/net/alcoholic_jwt/README.md
@@ -0,0 +1,62 @@
+alcoholic_jwt
+=============
+
+[![Build Status](https://travis-ci.org/aprilabank/alcoholic_jwt.svg?branch=master)](https://travis-ci.org/aprilabank/alcoholic_jwt)
+
+This is a library for **validation** of **RS256** JWTs using keys from
+a JWKS. Nothing more, nothing less.
+
+RS256 is the most commonly used asymmetric signature mechanism for
+JWTs, encountered in for example [Google][]'s or [Aprila][]'s APIs.
+
+The name of the library stems from the potential side-effects of
+trying to use the other Rust libraries that are made for similar
+purposes.
+
+## Usage overview
+
+You are retrieving JWTs from some authentication provider that uses
+`RS256` signatures and provides its public keys in [JWKS][] format.
+
+Example for a token that provides the key ID used for signing in the
+[`kid` claim][]:
+
+```rust
+extern crate alcoholic_jwt;
+
+use alcoholic_jwt::{JWKS, Validation, validate, token_kid};
+
+// The function implied here would usually perform an HTTP-GET
+// on the JWKS-URL for an authentication provider and deserialize
+// the result into the `alcoholic_jwt::JWKS`-struct.
+let jwks: JWKS = jwks_fetching_function();
+
+let token: String = some_token_fetching_function();
+
+// Several types of built-in validations are provided:
+let validations = vec![
+  Validation::Issuer("auth.test.aprila.no".into()),
+  Validation::SubjectPresent,
+];
+
+// If a JWKS contains multiple keys, the correct KID first
+// needs to be fetched from the token headers.
+let kid = token_kid(&token)
+    .expect("Failed to decode token headers")
+    .expect("No 'kid' claim present in token");
+
+let jwk = jwks.find(&kid).expect("Specified key not found in set");
+
+validate(token, jwk, validations).expect("Token validation has failed!");
+```
+
+## Under the hood
+
+This library aims to only use trustworthy off-the-shelf components to
+do the work. Cryptographic operations are provided by the `openssl`
+crate, JSON-serialisation is provided by `serde_json`.
+
+[Google]: https://www.google.com/
+[Aprila]: https://www.aprila.no/
+[JWKS]: https://tools.ietf.org/html/rfc7517
+[`kid` claim]: https://tools.ietf.org/html/rfc7515#section-4.1.4
diff --git a/net/alcoholic_jwt/default.nix b/net/alcoholic_jwt/default.nix
new file mode 100644
index 000000000000..c6b84fb7aba3
--- /dev/null
+++ b/net/alcoholic_jwt/default.nix
@@ -0,0 +1,9 @@
+{ depot, pkgs, ... }:
+
+depot.third_party.naersk.buildPackage {
+  src = ./.;
+  buildInputs = with pkgs; [
+    openssl
+    pkgconfig
+  ];
+}
diff --git a/net/alcoholic_jwt/src/lib.rs b/net/alcoholic_jwt/src/lib.rs
new file mode 100644
index 000000000000..4acd8d1e90db
--- /dev/null
+++ b/net/alcoholic_jwt/src/lib.rs
@@ -0,0 +1,465 @@
+// Copyright (C) 2018  Aprila Bank ASA
+//
+// alcoholic_jwt is free software: you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation, either version 3 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+//! Implements a library for for **validation** of **RS256** JWTs
+//! using keys from a JWKS. Nothing more, nothing less.
+//!
+//! The name of the library stems from the potential side-effects of
+//! trying to use the other Rust libraries that are made for similar
+//! purposes.
+//!
+//! This library is specifically aimed at developers that consume
+//! tokens from services which provide their RSA public keys in
+//! [JWKS][] format.
+//!
+//! ## Usage example (token with `kid`-claim)
+//!
+//! ```rust
+//! # extern crate serde_json;
+//! extern crate alcoholic_jwt;
+//!
+//! use alcoholic_jwt::{JWKS, Validation, validate, token_kid};
+//!
+//! # fn some_token_fetching_function() -> &'static str {
+//! #   "eyJraWQiOiI4ckRxOFB3MEZaY2FvWFdURVZRbzcrVGYyWXpTTDFmQnhOS1BDZWJhYWk0PSIsImFsZyI6IlJTMjU2IiwidHlwIjoiSldUIn0.eyJpc3MiOiJhdXRoLnRlc3QuYXByaWxhLm5vIiwiaWF0IjoxNTM2MDUwNjkzLCJleHAiOjE1MzYwNTQyOTMsInN1YiI6IjQyIiwiZXh0Ijoic21va2V0ZXN0IiwicHJ2IjoiYXJpc3RpIiwic2NwIjoicHJvY2VzcyJ9.gOLsv98109qLkmRK6Dn7WWRHLW7o8W78WZcWvFZoxPLzVO0qvRXXRLYc9h5chpfvcWreLZ4f1cOdvxv31_qnCRSQQPOeQ7r7hj_sPEDzhKjk-q2aoNHaGGJg1vabI--9EFkFsGQfoS7UbMMssS44dgR68XEnKtjn0Vys-Vzbvz_CBSCH6yQhRLik2SU2jR2L7BoFvh4LGZ6EKoQWzm8Z-CHXLGLUs4Hp5aPhF46dGzgAzwlPFW4t9G4DciX1uB4vv1XnfTc5wqJch6ltjKMde1GZwLR757a8dJSBcmGWze3UNE2YH_VLD7NCwH2kkqr3gh8rn7lWKG4AUIYPxsw9CB"
+//! # }
+//!
+//! # fn jwks_fetching_function() -> JWKS {
+//! #   let jwks_json = "{\"keys\":[{\"kty\":\"RSA\",\"alg\":\"RS256\",\"use\":\"sig\",\"kid\":\"8rDq8Pw0FZcaoXWTEVQo7+Tf2YzSL1fBxNKPCebaai4=\",\"n\":\"l4UTgk1zr-8C8utt0E57DtBV6qqAPWzVRrIuQS2j0_hp2CviaNl5XzGRDnB8gwk0Hx95YOhJupAe6RNq5ok3fDdxL7DLvppJNRLz3Ag9CsmDLcbXgNEQys33fBJaPw1v3GcaFC4tisU5p-o1f5RfWwvwdBtdBfGiwT1GRvbc5sFx6M4iYjg9uv1lNKW60PqSJW4iDYrfqzZmB0zF1SJ0BL_rnQZ1Wi_UkFmNe9arM8W9tI9T3Ie59HITFuyVSTCt6qQEtSfa1e5PiBaVuV3qoFI2jPBiVZQ6LPGBWEDyz4QtrHLdECPPoTF30NN6TSVwwlRbCuUUrdNdXdjYe2dMFQ\",\"e\":\"DhaD5zC7mzaDvHO192wKT_9sfsVmdy8w8T8C9VG17_b1jG2srd3cmc6Ycw-0blDf53Wrpi9-KGZXKHX6_uIuJK249WhkP7N1SHrTJxO0sUJ8AhK482PLF09Qtu6cUfJqY1X1y1S2vACJZItU4Vjr3YAfiVGQXeA8frAf7Sm4O1CBStCyg6yCcIbGojII0jfh2vSB-GD9ok1F69Nmk-R-bClyqMCV_Oq-5a0gqClVS8pDyGYMgKTww2RHgZaFSUcG13KeLMQsG2UOB2OjSC8FkOXK00NBlAjU3d0Vv-IamaLIszO7FQBY3Oh0uxNOvIE9ofQyCOpB-xIK6V9CTTphxw\"}]}";
+//! #   serde_json::from_str(jwks_json).unwrap()
+//! # }
+//! #
+//! // The function implied here would usually perform an HTTP-GET
+//! // on the JWKS-URL for an authentication provider and deserialize
+//! // the result into the `alcoholic_jwt::JWKS`-struct.
+//! let jwks: JWKS = jwks_fetching_function();
+//!
+//! let token = some_token_fetching_function();
+//!
+//! // Several types of built-in validations are provided:
+//! let validations = vec![
+//!   Validation::Issuer("auth.test.aprila.no".into()),
+//!   Validation::SubjectPresent,
+//! ];
+//!
+//! // If a JWKS contains multiple keys, the correct KID first
+//! // needs to be fetched from the token headers.
+//! let kid = token_kid(&token)
+//!     .expect("Failed to decode token headers")
+//!     .expect("No 'kid' claim present in token");
+//!
+//! let jwk = jwks.find(&kid).expect("Specified key not found in set");
+//!
+//! validate(token, jwk, validations).expect("Token validation has failed!");
+//! ```
+//!
+//! [JWKS]: https://tools.ietf.org/html/rfc7517
+
+#[macro_use] extern crate serde_derive;
+
+extern crate base64;
+extern crate openssl;
+extern crate serde;
+extern crate serde_json;
+
+use base64::{URL_SAFE_NO_PAD, Config, DecodeError};
+use openssl::bn::BigNum;
+use openssl::error::ErrorStack;
+use openssl::hash::MessageDigest;
+use openssl::pkey::{Public, PKey};
+use openssl::rsa::Rsa;
+use openssl::sign::Verifier;
+use serde::de::DeserializeOwned;
+use serde_json::Value;
+use std::time::{UNIX_EPOCH, Duration, SystemTime};
+
+#[cfg(test)]
+mod tests;
+
+/// URL-safe character set without padding that allows trailing bits,
+/// which appear in some JWT implementations.
+///
+/// Note: The functions on `base64::Config` are not marked `const`,
+/// and the constructors are not exported, which is why this is
+/// implemented as a function.
+fn jwt_forgiving() -> Config {
+    URL_SAFE_NO_PAD.decode_allow_trailing_bits(true)
+}
+
+/// JWT algorithm used. The only supported algorithm is currently
+/// RS256.
+#[derive(Clone, Deserialize, Debug)]
+enum KeyAlgorithm { RS256 }
+
+/// Type of key contained in a JWT. The only supported key type is
+/// currently RSA.
+#[derive(Clone, Deserialize, Debug)]
+enum KeyType { RSA }
+
+/// Representation of a single JSON Web Key. See [RFC
+/// 7517](https://tools.ietf.org/html/rfc7517#section-4).
+#[allow(dead_code)] // kty & alg only constrain deserialisation, but aren't used
+#[derive(Clone, Debug, Deserialize)]
+pub struct JWK {
+    kty: KeyType,
+    alg: Option<KeyAlgorithm>,
+    kid: Option<String>,
+
+    // Shared modulus
+    n: String,
+
+    // Public key exponent
+    e: String,
+}
+
+/// Representation of a set of JSON Web Keys. See [RFC
+/// 7517](https://tools.ietf.org/html/rfc7517#section-5).
+#[derive(Clone, Debug, Deserialize)]
+pub struct JWKS {
+    // This is a vector instead of some kind of map-like structure
+    // because key IDs are in fact optional.
+    //
+    // Technically having multiple keys with the same KID would not
+    // violate the JWKS-definition either, but behaviour in that case
+    // is unspecified.
+    keys: Vec<JWK>,
+}
+
+impl JWKS {
+    /// Attempt to find a JWK by its key ID.
+    pub fn find(&self, kid: &str) -> Option<&JWK> {
+        self.keys.iter().find(|jwk| jwk.kid == Some(kid.into()))
+    }
+}
+
+/// Representation of an undecoded JSON Web Token. See [RFC
+/// 7519](https://tools.ietf.org/html/rfc7519).
+struct JWT<'a> (&'a str);
+
+/// Representation of a decoded and validated JSON Web Token.
+///
+/// Specific claim fields are only decoded internally in the library
+/// for validation purposes, while it is generally up to the consumer
+/// of the validated JWT what structure they would like to impose.
+pub struct ValidJWT {
+    /// JOSE header of the JSON Web Token. Certain fields are
+    /// guaranteed to be present in this header, consult section 5 of
+    /// RFC7519 for more information.
+    pub headers: Value,
+
+    /// Claims (i.e. primary data) contained in the JSON Web Token.
+    /// While there are several registered and recommended headers
+    /// (consult section 4.1 of RFC7519), the presence of no field is
+    /// guaranteed in these.
+    pub claims: Value,
+}
+
+/// Possible token claim validations. This enumeration only covers
+/// common use-cases, for other types of validations the user is
+/// encouraged to inspect the claim set manually.
+pub enum Validation {
+    /// Validate that the issuer ("iss") claim matches a specified
+    /// value.
+    Issuer(String),
+
+    /// Validate that the audience ("aud") claim matches a specified
+    /// value.
+    Audience(String),
+
+    /// Validate that a subject value is present.
+    SubjectPresent,
+
+    /// Validate that the expiry time of the token ("exp"-claim) has
+    /// not yet been reached.
+    NotExpired,
+}
+
+/// Possible results of a token validation.
+#[derive(Debug)]
+pub enum ValidationError {
+    /// Invalid number of token components (not a JWT?)
+    InvalidComponents,
+
+    /// Token segments had invalid base64-encoding.
+    InvalidBase64(DecodeError),
+
+    /// Decoding of the provided JWK failed.
+    InvalidJWK,
+
+    /// Signature validation failed, i.e. because of a non-matching
+    /// public key.
+    InvalidSignature,
+
+    /// An OpenSSL operation failed along the way at a point at which
+    /// a more specific error variant could not be constructed.
+    OpenSSL(ErrorStack),
+
+    /// JSON decoding into a provided type failed.
+    JSON(serde_json::Error),
+
+    /// One or more claim validations failed. This variant contains
+    /// human-readable validation errors.
+    InvalidClaims(Vec<&'static str>),
+}
+
+type JWTResult<T> = Result<T, ValidationError>;
+
+impl From<ErrorStack> for ValidationError {
+    fn from(err: ErrorStack) -> Self { ValidationError::OpenSSL(err) }
+}
+
+impl From<serde_json::Error> for ValidationError {
+    fn from(err: serde_json::Error) -> Self { ValidationError::JSON(err) }
+}
+
+impl From<DecodeError> for ValidationError {
+    fn from(err: DecodeError) -> Self { ValidationError::InvalidBase64(err) }
+}
+
+/// Attempt to extract the `kid`-claim out of a JWT's header claims.
+///
+/// This function is normally used when a token provider has multiple
+/// public keys in rotation at the same time that could all still have
+/// valid tokens issued under them.
+///
+/// This is only safe if the key set containing the currently allowed
+/// key IDs is fetched from a trusted source.
+pub fn token_kid(token: &str) -> JWTResult<Option<String>> {
+    // Fetch the header component of the JWT by splitting it out and
+    // dismissing the rest.
+    let parts: Vec<&str> = token.splitn(2, '.').collect();
+    if parts.len() != 2 {
+        return Err(ValidationError::InvalidComponents);
+    }
+
+    // Decode only the first part of the token into a specialised
+    // representation:
+    #[derive(Deserialize)]
+    struct KidOnly {
+        kid: Option<String>,
+    }
+
+    let kid_only: KidOnly = deserialize_part(parts[0])?;
+
+    Ok(kid_only.kid)
+}
+
+/// Validate the signature of a JSON Web Token and optionally apply
+/// claim validations. Signatures are always verified before claims,
+/// and if a signature verification passes *all* claim validations are
+/// run and returned.
+///
+/// If validation succeeds a representation of the token is returned
+/// that contains the header and claims as simple JSON values.
+///
+/// It is the user's task to ensure that the correct JWK is passed in
+/// for validation.
+pub fn validate(token: &str,
+                jwk: &JWK,
+                validations: Vec<Validation>) -> JWTResult<ValidJWT> {
+    let jwt = JWT(token);
+    let public_key = public_key_from_jwk(&jwk)?;
+    validate_jwt_signature(&jwt, public_key)?;
+
+    // Split out all three parts of the JWT this time, deserialising
+    // the first and second as appropriate.
+    let parts: Vec<&str> = jwt.0.splitn(3, '.').collect();
+    if parts.len() != 3 {
+        // This is unlikely considering that validation has already
+        // been performed at this point, but better safe than sorry.
+        return Err(ValidationError::InvalidComponents)
+    }
+
+    // Perform claim validations before constructing the valid token:
+    let partial_claims = deserialize_part(parts[1])?;
+    validate_claims(partial_claims, validations)?;
+
+    let headers = deserialize_part(parts[0])?;
+    let claims = deserialize_part(parts[1])?;
+    let valid_jwt = ValidJWT { headers, claims };
+
+    Ok(valid_jwt)
+}
+
+// Internal implementation
+//
+// The functions in the following section are not part of the public
+// API of this library.
+
+/// Decode a single key fragment (base64-url encoded integer) to an
+/// OpenSSL BigNum.
+fn decode_fragment(fragment: &str) -> JWTResult<BigNum> {
+    let bytes = base64::decode_config(fragment, jwt_forgiving())
+        .map_err(|_| ValidationError::InvalidJWK)?;
+
+    BigNum::from_slice(&bytes).map_err(Into::into)
+}
+
+/// Decode an RSA public key from a JWK by constructing it directly
+/// from the public RSA key fragments.
+fn public_key_from_jwk(jwk: &JWK) -> JWTResult<Rsa<Public>> {
+    let jwk_n = decode_fragment(&jwk.n)?;
+    let jwk_e = decode_fragment(&jwk.e)?;
+    Rsa::from_public_components(jwk_n, jwk_e).map_err(Into::into)
+}
+
+/// Decode a base64-URL encoded string and deserialise the resulting
+/// JSON.
+fn deserialize_part<T: DeserializeOwned>(part: &str) -> JWTResult<T> {
+    let json = base64::decode_config(part, jwt_forgiving())?;
+    serde_json::from_slice(&json).map_err(Into::into)
+}
+
+/// Validate the signature on a JWT using a provided public key.
+///
+/// A JWT is made up of three components (headers, claims, signature)
+/// - only the first two are part of the signed data.
+fn validate_jwt_signature(jwt: &JWT, key: Rsa<Public>) -> JWTResult<()> {
+    let key = PKey::from_rsa(key)?;
+    let mut verifier = Verifier::new(MessageDigest::sha256(), &key)?;
+
+    // Split the token from the back to a maximum of two elements.
+    // There are technically three components using the same separator
+    // ('.'), but we are interested in the first two together and
+    // splitting them is unnecessary.
+    let token_parts: Vec<&str> = jwt.0.rsplitn(2, '.').collect();
+    if token_parts.len() != 2 {
+        return Err(ValidationError::InvalidComponents);
+    }
+
+    // Second element of the vector will be the signed payload.
+    let data = token_parts[1];
+
+    // First element of the vector will be the (encoded) signature.
+    let sig_b64 = token_parts[0];
+    let sig = base64::decode_config(sig_b64, jwt_forgiving())?;
+
+    // Verify signature by inserting the payload data and checking it
+    // against the decoded signature.
+    verifier.update(data.as_bytes())?;
+
+    match verifier.verify(&sig)? {
+        true  => Ok(()),
+        false => Err(ValidationError::InvalidSignature),
+    }
+}
+
+/// Internal helper enum for PartialClaims that supports single or
+/// multiple audiences
+#[derive(Deserialize)]
+#[serde(untagged)]
+enum Audience {
+    Single(String),
+    Multi(Vec<String>)
+}
+
+/// Internal helper struct for claims that are relevant for claim
+/// validations.
+#[derive(Deserialize)]
+struct PartialClaims {
+    aud: Option<Audience>,
+    iss: Option<String>,
+    sub: Option<String>,
+    exp: Option<u64>,
+}
+
+/// Apply a single validation to the claim set of a token.
+fn apply_validation(claims: &PartialClaims,
+                    validation: Validation) -> Result<(), &'static str> {
+    match validation {
+        // Validate that an 'iss' claim is present and matches the
+        // supplied value.
+        Validation::Issuer(iss) => {
+            match claims.iss {
+                None => Err("'iss' claim is missing"),
+                Some(ref claim) => if *claim == iss {
+                    Ok(())
+                } else {
+                    Err("'iss' claim does not match")
+                }
+            }
+        },
+
+        // Validate that an 'aud' claim is present and matches the
+        // supplied value.
+        Validation::Audience(aud) => {
+            match claims.aud {
+                None => Err("'aud' claim is missing"),
+                Some(Audience::Single(ref claim)) => if *claim == aud {
+                    Ok(())
+                } else {
+                    Err("'aud' claim does not match")
+                },
+                Some(Audience::Multi(ref claims)) => if claims.contains(&aud) {
+                    Ok(())
+                } else {
+                    Err("'aud' claim does not match")
+                }
+            }
+        },
+
+        Validation::SubjectPresent => match claims.sub {
+            Some(_) => Ok(()),
+            None => Err("'sub' claim is missing"),
+        },
+
+        Validation::NotExpired => match claims.exp {
+            None => Err("'exp' claim is missing"),
+            Some(exp) => {
+                // Determine the current timestamp in seconds since
+                // the UNIX epoch.
+                let now = SystemTime::now()
+                    .duration_since(UNIX_EPOCH)
+                    // this is an unrecoverable, critical error. There
+                    // aren't many ways this can occur, other than
+                    // system time being set into the far future or
+                    // this library being used in some sort of future
+                    // museum.
+                    .expect("system time is likely incorrect");
+
+                // Convert the expiry time (which is also in epoch
+                // seconds) to a duration.
+                let exp_duration = Duration::from_secs(exp);
+
+                // The token has not expired if the expiry duration is
+                // larger than (i.e. in the future from) the current
+                // time.
+                if exp_duration > now {
+                    Ok(())
+                } else {
+                    Err("token has expired")
+                }
+            }
+        },
+    }
+}
+
+/// Apply all requested validations to a partial claim set.
+fn validate_claims(claims: PartialClaims,
+                   validations: Vec<Validation>) -> JWTResult<()> {
+    let validation_errors: Vec<_> = validations.into_iter()
+        .map(|v| apply_validation(&claims, v))
+        .filter_map(|result| match result {
+            Ok(_)    => None,
+            Err(err) => Some(err),
+        })
+        .collect();
+
+    if validation_errors.is_empty() {
+        Ok(())
+    } else {
+        Err(ValidationError::InvalidClaims(validation_errors))
+    }
+}
diff --git a/net/alcoholic_jwt/src/tests.rs b/net/alcoholic_jwt/src/tests.rs
new file mode 100644
index 000000000000..81890986f8a2
--- /dev/null
+++ b/net/alcoholic_jwt/src/tests.rs
@@ -0,0 +1,61 @@
+// Copyright (C) 2018  Aprila Bank ASA
+//
+// alcoholic_jwt is free software: you can redistribute it and/or
+// modify it under the terms of the GNU General Public License as
+// published by the Free Software Foundation, either version 3 of the
+// License, or (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+use super::*;
+
+#[test]
+fn test_fragment_decoding() {
+    let fragment = "ngRRjNbXgPW29oNtF0JgsyyfTwPyEL0u_X16s453X2AOc33XGFxVKLEQ7R_TiMenaKcr-tPifYqgps_deyi0XOr4I3SOdOMtAVKDZJCANe--CANOHZb-meIfjKhCHisvT90fm5Apd6qPRVsXsZ7A8pmClZHKM5fwZUkBv8NsPLm2Xy2sGOZIiwP_7z8m3j0abUzniPQsx2b3xcWimB9vRtshFHN1KgPUf1ALQ5xzLfJnlFkCxC7kmOxKC7_NpQ4kJR_DKzKFV_r3HxTqf-jddHcXIrrMcLQXCSyeLQtLaz7whQ4F-EfL42z4XgwPr4ji3sct2gWL13EqlbE5DDxLKQ";
+    let bignum = decode_fragment(fragment).expect("Failed to decode fragment");
+
+    let expected = "19947781743618558124649689124245117083485690334420160711273532766920651190711502679542723943527557680293732686428091794139998732541701457212387600480039297092835433997837314251024513773285252960725418984381935183495143908023024822433135775773958512751261112853383693442999603704969543668619221464654540065497665889289271044207667765128672709218996183649696030570183970367596949687544839066873508106034650634722970893169823917299050098551447676778961773465887890052852528696684907153295689693676910831376066659456592813140662563597179711588277621736656871685099184755908108451080261403193680966083938080206832839445289";
+    assert_eq!(expected, format!("{}", bignum), "Decoded fragment should match ");
+}
+
+#[test]
+fn test_decode_find_jwks() {
+    let json = "{\"keys\":[{\"kty\":\"RSA\",\"alg\":\"RS256\",\"use\":\"sig\",\"kid\":\"mUjI\\/rIMLLtung35BKZfdbrqtlEAAYJ4JX\\/SKvnLxJc=\",\"n\":\"ngRRjNbXgPW29oNtF0JgsyyfTwPyEL0u_X16s453X2AOc33XGFxVKLEQ7R_TiMenaKcr-tPifYqgps_deyi0XOr4I3SOdOMtAVKDZJCANe--CANOHZb-meIfjKhCHisvT90fm5Apd6qPRVsXsZ7A8pmClZHKM5fwZUkBv8NsPLm2Xy2sGOZIiwP_7z8m3j0abUzniPQsx2b3xcWimB9vRtshFHN1KgPUf1ALQ5xzLfJnlFkCxC7kmOxKC7_NpQ4kJR_DKzKFV_r3HxTqf-jddHcXIrrMcLQXCSyeLQtLaz7whQ4F-EfL42z4XgwPr4ji3sct2gWL13EqlbE5DDxLKQ\",\"e\":\"GK7oLCDbNPAF59LhvyseqcG04hDnPs58qGYolr_HHmaR4lulWJ90ozx6e4Ut363yKG2p9vwvivR5UIC-aLPtqT2qr-OtjhBFzUFVaMGZ6mPCvMKk0AgMYdOHvWTgBSqQtNJTvl1yYLnhcWyoE2fLQhoEbY9qUyCBCEOScXOZRDpnmBtz5I8q5yYMV6a920J24T_IYbxHgkGcEU2SGg-b1cOMD7Rja7vCfV---CQ2pR4leQ0jufzudDoe7z3mziJm-Ihcdrz2Ujy5kPEMdz6R55prJ-ENKrkD_X4u5aSlSRaetwmHS3oAVkjr1JwUNbqnpM-kOqieqHEp8LUmez-Znw\"}]}";
+    let jwks: JWKS = serde_json::from_str(json).expect("Failed to decode JWKS");
+    let jwk = jwks.find("mUjI/rIMLLtung35BKZfdbrqtlEAAYJ4JX/SKvnLxJc=")
+        .expect("Failed to find required JWK");
+
+    public_key_from_jwk(&jwk).expect("Failed to construct public key from JWK");
+}
+
+#[test]
+fn test_token_kid() {
+    let jwt = "eyJraWQiOiI4ckRxOFB3MEZaY2FvWFdURVZRbzcrVGYyWXpTTDFmQnhOS1BDZWJhYWk0PSIsImFsZyI6IlJTMjU2IiwidHlwIjoiSldUIn0.eyJpc3MiOiJhdXRoLnRlc3QuYXByaWxhLm5vIiwiaWF0IjoxNTM2MDUwNjkzLCJleHAiOjE1MzYwNTQyOTMsInN1YiI6IjQyIiwiZXh0Ijoic21va2V0ZXN0IiwicHJ2IjoiYXJpc3RpIiwic2NwIjoicHJvY2VzcyJ9.gOLsv98109qLkmRK6Dn7WWRHLW7o8W78WZcWvFZoxPLzVO0qvRXXRLYc9h5chpfvcWreLZ4f1cOdvxv31_qnCRSQQPOeQ7r7hj_sPEDzhKjk-q2aoNHaGGJg1vabI--9EFkFsGQfoS7UbMMssS44dgR68XEnKtjn0Vys-Vzbvz_CBSCH6yQhRLik2SU2jR2L7BoFvh4LGZ6EKoQWzm8Z-CHXLGLUs4Hp5aPhF46dGzgAzwlPFW4t9G4DciX1uB4vv1XnfTc5wqJch6ltjKMde1GZwLR757a8dJSBcmGWze3UNE2YH_VLD7NCwH2kkqr3gh8rn7lWKG4AUIYPxsw9CB";
+
+    let kid = token_kid(&jwt).expect("Failed to extract token KID");
+    assert_eq!(Some("8rDq8Pw0FZcaoXWTEVQo7+Tf2YzSL1fBxNKPCebaai4=".into()),
+               kid, "Extracted KID did not match expected KID");
+}
+
+#[test]
+fn test_validate_jwt() {
+    let jwks_json = "{\"keys\":[{\"kty\":\"RSA\",\"alg\":\"RS256\",\"use\":\"sig\",\"kid\":\"8rDq8Pw0FZcaoXWTEVQo7+Tf2YzSL1fBxNKPCebaai4=\",\"n\":\"l4UTgk1zr-8C8utt0E57DtBV6qqAPWzVRrIuQS2j0_hp2CviaNl5XzGRDnB8gwk0Hx95YOhJupAe6RNq5ok3fDdxL7DLvppJNRLz3Ag9CsmDLcbXgNEQys33fBJaPw1v3GcaFC4tisU5p-o1f5RfWwvwdBtdBfGiwT1GRvbc5sFx6M4iYjg9uv1lNKW60PqSJW4iDYrfqzZmB0zF1SJ0BL_rnQZ1Wi_UkFmNe9arM8W9tI9T3Ie59HITFuyVSTCt6qQEtSfa1e5PiBaVuV3qoFI2jPBiVZQ6LPGBWEDyz4QtrHLdECPPoTF30NN6TSVwwlRbCuUUrdNdXdjYe2dMFQ\",\"e\":\"DhaD5zC7mzaDvHO192wKT_9sfsVmdy8w8T8C9VG17_b1jG2srd3cmc6Ycw-0blDf53Wrpi9-KGZXKHX6_uIuJK249WhkP7N1SHrTJxO0sUJ8AhK482PLF09Qtu6cUfJqY1X1y1S2vACJZItU4Vjr3YAfiVGQXeA8frAf7Sm4O1CBStCyg6yCcIbGojII0jfh2vSB-GD9ok1F69Nmk-R-bClyqMCV_Oq-5a0gqClVS8pDyGYMgKTww2RHgZaFSUcG13KeLMQsG2UOB2OjSC8FkOXK00NBlAjU3d0Vv-IamaLIszO7FQBY3Oh0uxNOvIE9ofQyCOpB-xIK6V9CTTphxw\"}]}";
+
+    let jwks: JWKS = serde_json::from_str(jwks_json)
+        .expect("Failed to decode JWKS");
+
+    let jwk = jwks.find("8rDq8Pw0FZcaoXWTEVQo7+Tf2YzSL1fBxNKPCebaai4=")
+        .expect("Failed to find required JWK");
+
+    let pkey = public_key_from_jwk(&jwk).expect("Failed to construct public key");
+
+    let jwt = JWT("eyJraWQiOiI4ckRxOFB3MEZaY2FvWFdURVZRbzcrVGYyWXpTTDFmQnhOS1BDZWJhYWk0PSIsImFsZyI6IlJTMjU2IiwidHlwIjoiSldUIn0.eyJpc3MiOiJhdXRoLnRlc3QuYXByaWxhLm5vIiwiaWF0IjoxNTM2MDUwNjkzLCJleHAiOjE1MzYwNTQyOTMsInN1YiI6IjQyIiwiZXh0Ijoic21va2V0ZXN0IiwicHJ2IjoiYXJpc3RpIiwic2NwIjoicHJvY2VzcyJ9.gOLsv98109qLkmRK6Dn7WWRHLW7o8W78WZcWvFZoxPLzVO0qvRXXRLYc9h5chpfvcWreLZ4f1cOdvxv31_qnCRSQQPOeQ7r7hj_sPEDzhKjk-q2aoNHaGGJg1vabI--9EFkFsGQfoS7UbMMssS44dgR68XEnKtjn0Vys-Vzbvz_CBSCH6yQhRLik2SU2jR2L7BoFvh4LGZ6EKoQWzm8Z-CHXLGLUs4Hp5aPhF46dGzgAzwlPFW4t9G4DciX1uB4vv1XnfTc5wqJch6ltjKMde1GZwLR757a8dJSBcmGWze3UNE2YH_VLD7NCwH2kkqr3gh8rn7lWKG4AUIYPxsw9CB".into());
+
+    validate_jwt_signature(&jwt, pkey).expect("Validation failed unexpectedly");
+}
diff --git a/net/crimp/.gitignore b/net/crimp/.gitignore
new file mode 100644
index 000000000000..693699042b1a
--- /dev/null
+++ b/net/crimp/.gitignore
@@ -0,0 +1,3 @@
+/target
+**/*.rs.bk
+Cargo.lock
diff --git a/net/crimp/Cargo.lock b/net/crimp/Cargo.lock
new file mode 100644
index 000000000000..9875e6004b38
--- /dev/null
+++ b/net/crimp/Cargo.lock
@@ -0,0 +1,178 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "autocfg"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "cdb031dd78e28731d87d56cc8ffef4a8f36ca26c38fe2de700543e627f8a464a"
+
+[[package]]
+name = "cc"
+version = "1.0.69"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e70cc2f62c6ce1868963827bd677764c62d07c3d9a3e1fb1177ee1a9ab199eb2"
+
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diff --git a/net/crimp/Cargo.toml b/net/crimp/Cargo.toml
new file mode 100644
index 000000000000..13c80f1f6950
--- /dev/null
+++ b/net/crimp/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "crimp"
+description = "Higher-level Rust API for cURL bindings"
+version = "0.2.2"
+authors = ["Vincent Ambo <mail@tazj.in>"]
+keywords = [ "http", "curl" ]
+categories = [ "api-bindings" ]
+license = "GPL-3.0-or-later"
+repository = "https://github.com/tazjin/crimp"
+
+[features]
+default = [ "json" ]
+json = [ "serde", "serde_json"]
+
+[dependencies]
+curl = "0.4"
+serde = { version = "1.0", optional = true }
+serde_json = { version = "1.0", optional = true }
diff --git a/net/crimp/LICENSE b/net/crimp/LICENSE
new file mode 100644
index 000000000000..94a9ed024d38
--- /dev/null
+++ b/net/crimp/LICENSE
@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
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+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
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+  12. No Surrender of Others' Freedom.
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+  17. Interpretation of Sections 15 and 16.
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+  If the disclaimer of warranty and limitation of liability provided
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+                     END OF TERMS AND CONDITIONS
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+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
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+
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+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
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+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<http://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
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+Public License instead of this License.  But first, please read
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diff --git a/net/crimp/README.md b/net/crimp/README.md
new file mode 100644
index 000000000000..791c354fc1d9
--- /dev/null
+++ b/net/crimp/README.md
@@ -0,0 +1,15 @@
+crimp
+=====
+
+[![Build Status](https://travis-ci.org/tazjin/crimp.svg?branch=master)](https://travis-ci.org/tazjin/crimp)
+[![](https://img.shields.io/crates/v/crimp.svg)](https://crates.io/crates/crimp)
+[![](https://docs.rs/crimp/badge.svg)](https://docs.rs/crimp)
+
+Crimp is an HTTP client interface on top of the [Rust bindings][] to
+cURL.
+
+The documentation for this crate is primarily in the [module
+documentation][]
+
+[Rust bindings]: https://docs.rs/curl
+[module documentation]: https://docs.rs/crimp
diff --git a/net/crimp/default.nix b/net/crimp/default.nix
new file mode 100644
index 000000000000..c6b84fb7aba3
--- /dev/null
+++ b/net/crimp/default.nix
@@ -0,0 +1,9 @@
+{ depot, pkgs, ... }:
+
+depot.third_party.naersk.buildPackage {
+  src = ./.;
+  buildInputs = with pkgs; [
+    openssl
+    pkgconfig
+  ];
+}
diff --git a/net/crimp/src/lib.rs b/net/crimp/src/lib.rs
new file mode 100644
index 000000000000..b52ebc3ef09c
--- /dev/null
+++ b/net/crimp/src/lib.rs
@@ -0,0 +1,502 @@
+// crimp - Higher-level Rust cURL API
+//
+// Copyright (C) 2019 Vincent Ambo
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+//! # crimp
+//!
+//! This library provides a simplified API over the [cURL Rust
+//! bindings][] that resemble that of higher-level libraries such as
+//! [reqwest][]. All calls are synchronous.
+//!
+//! `crimp` is intended to be used in situations where HTTP client
+//! functionality is desired without adding a significant number of
+//! dependencies or sacrificing too much usability.
+//!
+//! Using `crimp` to make HTTP requests is done using a simple
+//! builder-pattern style API. For example, to make a `GET`-request
+//! and print the result to `stdout`:
+//!
+//! ```rust
+//! use crimp::Request;
+//!
+//! let response = Request::get("http://httpbin.org/get")
+//!     .user_agent("crimp test suite").unwrap()
+//!     .send().unwrap()
+//!     .as_string().unwrap();
+//!
+//! println!("Status: {}\nBody: {}", response.status, response.body);
+//! # assert_eq!(response.status, 200);
+//! ```
+//!
+//! If a feature from the underlying cURL library is missing, the
+//! `Request::raw` method can be used as an escape hatch to deal with
+//! the handle directly. Should you find yourself doing this, please
+//! [file an issue][].
+//!
+//! `crimp` does not currently expose functionality for re-using a
+//! cURL Easy handle, meaning that keep-alive of HTTP connections and
+//! the like is not supported.
+//!
+//! ## Cargo features
+//!
+//! All optional features are enabled by default.
+//!
+//! * `json`: Adds `Request::json` and `Response::as_json` methods
+//!   which can be used for convenient serialisation of
+//!   request/response bodies using `serde_json`. This feature adds a
+//!   dependency on the `serde` and `serde_json` crates.
+//!
+//! ## Initialisation
+//!
+//! It is recommended to call the underlying `curl::init` method
+//! (re-exported as `crimp::init`) when launching your application to
+//! initialise the cURL library. This is not required, but will
+//! otherwise occur the first time a request is made.
+//!
+//! [cURL Rust bindings]: https://docs.rs/curl
+//! [reqwest]: https://docs.rs/reqwest
+//! [file an issue]: https://github.com/tazjin/crimp/issues
+
+extern crate curl;
+
+#[cfg(feature = "json")] extern crate serde;
+#[cfg(feature = "json")] extern crate serde_json;
+
+pub use curl::init;
+
+use curl::easy::{Auth, Easy, Form, List, Transfer, ReadError, WriteError};
+use std::collections::HashMap;
+use std::io::Write;
+use std::path::Path;
+use std::string::{FromUtf8Error, ToString};
+use std::time::Duration;
+
+#[cfg(feature = "json")] use serde::Serialize;
+#[cfg(feature = "json")] use serde::de::DeserializeOwned;
+
+#[cfg(test)]
+mod tests;
+
+/// HTTP method to use for the request.
+enum Method {
+    Get, Post, Put, Patch, Delete
+}
+
+/// Certificate types for client-certificate key pairs.
+pub enum CertType {
+    P12, PEM, DER
+}
+
+/// Builder structure for an HTTP request.
+///
+/// This is the primary API-type in `crimp`. After creating a new
+/// request its parameters are modified using the various builder
+/// methods until it is consumed by `send()`.
+pub struct Request<'a> {
+    url: &'a str,
+    method: Method,
+    handle: Easy,
+    headers: List,
+    body: Body<'a>,
+}
+
+enum Body<'a> {
+    NoBody,
+    Form(Form),
+
+    Bytes {
+        content_type: &'a str,
+        data: &'a [u8],
+    },
+
+    #[cfg(feature = "json")]
+    Json(Vec<u8>),
+}
+
+/// HTTP responses structure containing response data and headers.
+///
+/// By default the `send()` function of the `Request` structure will
+/// return a `Response<Vec<u8>>`. Convenience helpers exist for
+/// decoding a string via `Response::as_string` or to a
+/// `serde`-compatible type with `Response::as_json` (if the
+/// `json`-feature is enabled).
+#[derive(Debug, PartialEq)]
+pub struct Response<T> {
+    /// HTTP status code of the response.
+    pub status: u32,
+
+    /// HTTP headers returned from the remote.
+    pub headers: HashMap<String, String>,
+
+    /// Body data from the HTTP response.
+    pub body: T,
+}
+
+impl <'a> Request<'a> {
+    /// Initiate an HTTP request with the given method and URL.
+    fn new(method: Method, url: &'a str) -> Self {
+        Request {
+            url,
+            method,
+            handle: Easy::new(),
+            headers: List::new(),
+            body: Body::NoBody,
+        }
+    }
+
+    /// Initiate a GET request with the given URL.
+    pub fn get(url: &'a str) -> Self { Request::new(Method::Get, url) }
+
+    /// Initiate a POST request with the given URL.
+    pub fn post(url: &'a str) -> Self { Request::new(Method::Post, url) }
+
+    /// Initiate a PUT request with the given URL.
+    pub fn put(url: &'a str) -> Self { Request::new(Method::Put, url) }
+
+    /// Initiate a PATCH request with the given URL.
+    pub fn patch(url: &'a str) -> Self { Request::new(Method::Patch, url) }
+
+    /// Initiate a DELETE request with the given URL.
+    pub fn delete(url: &'a str) -> Self { Request::new(Method::Delete, url) }
+
+    /// Add an HTTP header to a request.
+    pub fn header(mut self, k: &str, v: &str) -> Result<Self, curl::Error> {
+        self.headers.append(&format!("{}: {}", k, v))?;
+        Ok(self)
+    }
+
+    /// Set the `User-Agent` for this request. By default this will be
+    /// set to cURL's standard user agent.
+    pub fn user_agent(mut self, agent: &str) -> Result<Self, curl::Error> {
+        self.handle.useragent(agent)?;
+        Ok(self)
+    }
+
+    /// Set the `Authorization` header to a `Bearer` value with the
+    /// supplied token.
+    pub fn bearer_auth(mut self, token: &str) -> Result<Self, curl::Error> {
+        self.headers.append(&format!("Authorization: Bearer {}", token))?;
+        Ok(self)
+    }
+
+    /// Set the `Authorization` header to a basic authentication value
+    /// from the supplied username and password.
+    pub fn basic_auth(mut self, username: &str, password: &str) -> Result<Self, curl::Error> {
+        let mut auth = Auth::new();
+        auth.basic(true);
+        self.handle.username(username)?;
+        self.handle.password(password)?;
+        self.handle.http_auth(&auth)?;
+        Ok(self)
+    }
+
+    /// Configure a TLS client certificate on the request.
+    ///
+    /// Depending on whether the certificate file contains the private
+    /// key or not, calling `tls_client_key` may be required in
+    /// addition.
+    ///
+    /// Consult the documentation for the `ssl_cert` and `ssl_key`
+    /// functions in `curl::easy::Easy2` for details on supported
+    /// formats and defaults.
+    pub fn tls_client_cert<P: AsRef<Path>>(mut self, cert_type: CertType, cert: P)
+                                           -> Result<Self, curl::Error> {
+        self.handle.ssl_cert(cert)?;
+        self.handle.ssl_cert_type(match cert_type {
+            CertType::P12 => "P12",
+            CertType::PEM => "PEM",
+            CertType::DER => "DER",
+        })?;
+
+        Ok(self)
+    }
+
+    /// Configure a TLS client certificate key on the request.
+    ///
+    /// Note that this does **not** need to be called again for
+    /// PKCS12-encoded key pairs which are set via `tls_client_cert`.
+    ///
+    /// Currently only PEM-encoded key files are supported.
+    pub fn tls_client_key<P: AsRef<Path>>(mut self, key: P) -> Result<Self, curl::Error> {
+        self.handle.ssl_key(key)?;
+        Ok(self)
+    }
+
+    /// Configure an encryption password for a TLS client certificate
+    /// key on the request.
+    ///
+    /// This is required in case of an encrypted private key that
+    /// should be used.
+    pub fn tls_key_password(mut self, password: &str) -> Result<Self, curl::Error> {
+        self.handle.key_password(password)?;
+        Ok(self)
+    }
+
+    /// Configure a timeout for the request after which the request
+    /// will be aborted.
+    pub fn timeout(mut self, timeout: Duration) -> Result<Self, curl::Error> {
+        self.handle.timeout(timeout)?;
+        Ok(self)
+    }
+
+    /// Set custom configuration on the cURL `Easy` handle.
+    ///
+    /// This function can be considered an "escape-hatch" from the
+    /// high-level API which lets users access the internal
+    /// `curl::easy::Easy` handle and configure options on it
+    /// directly.
+    ///
+    /// ```
+    /// # use crimp::Request;
+    /// let response = Request::get("https://httpbin.org/get")
+    ///     .with_handle(|mut handle| handle.referer("Example-Referer")).unwrap()
+    ///     .send().unwrap();
+    /// #
+    /// # assert!(response.is_success());
+    /// ```
+    pub fn with_handle<F>(mut self, function: F) -> Result<Self, curl::Error>
+    where F: FnOnce(&mut Easy) -> Result<(), curl::Error> {
+        function(&mut self.handle)?;
+        Ok(self)
+    }
+
+    /// Add a byte-array body to a request using the specified
+    /// `Content-Type`.
+    pub fn body(mut self, content_type: &'a str, data: &'a [u8]) -> Self {
+        self.body = Body::Bytes { data, content_type };
+        self
+    }
+
+    /// Add a form-encoded body to a request using the `curl::Form`
+    /// type.
+    ///
+    /// ```rust
+    /// # extern crate curl;
+    /// # extern crate serde_json;
+    /// # use crimp::*;
+    /// # use serde_json::{Value, json};
+    /// use curl::easy::Form;
+    ///
+    /// let mut form = Form::new();
+    /// form.part("some-name")
+    ///     .contents("some-data".as_bytes())
+    ///     .add().unwrap();
+    ///
+    /// let response = Request::post("https://httpbin.org/post")
+    ///     .user_agent("crimp test suite").unwrap()
+    ///     .form(form)
+    ///     .send().unwrap();
+    /// #
+    /// # assert_eq!(200, response.status, "form POST should succeed");
+    /// # assert_eq!(
+    /// #     response.as_json::<Value>().unwrap().body.get("form").unwrap(),
+    /// #     &json!({"some-name": "some-data"}),
+    /// #     "posted form data should match",
+    /// # );
+    /// ```
+    ///
+    /// See the documentation of `curl::easy::Form` for details on how
+    /// to construct a form body.
+    pub fn form(mut self, form: Form) -> Self {
+        self.body = Body::Form(form);
+        self
+    }
+
+    /// Add a JSON-encoded body from a serializable type.
+    #[cfg(feature = "json")]
+    pub fn json<T: Serialize>(mut self, body: &T) -> Result<Self, serde_json::Error> {
+        let json = serde_json::to_vec(body)?;
+        self.body = Body::Json(json);
+        Ok(self)
+    }
+
+    /// Send the HTTP request and return a response structure
+    /// containing the raw body.
+    pub fn send(mut self) -> Result<Response<Vec<u8>>, curl::Error> {
+        // Configure request basics:
+        self.handle.url(self.url)?;
+
+        match self.method {
+            Method::Get    => self.handle.get(true)?,
+            Method::Post   => self.handle.post(true)?,
+            Method::Put    => self.handle.put(true)?,
+            Method::Patch  => self.handle.custom_request("PATCH")?,
+            Method::Delete => self.handle.custom_request("DELETE")?,
+        }
+
+        // Create structures in which to store the response data:
+        let mut headers = HashMap::new();
+        let mut body = vec![];
+
+        // Submit a form value to cURL if it is set and proceed
+        // pretending that there is no body, as the handling of this
+        // type of body happens under-the-hood.
+        if let Body::Form(form) = self.body {
+            self.handle.httppost(form)?;
+            self.body = Body::NoBody;
+        }
+
+        // Optionally set content type if a body payload is configured
+        // and configure the expected body size (or form payload).
+         match self.body {
+            Body::Bytes { content_type, data } => {
+                self.handle.post_field_size(data.len() as u64)?;
+                self.headers.append(&format!("Content-Type: {}", content_type))?;
+            },
+
+            #[cfg(feature = "json")]
+            Body::Json(ref data) => {
+                self.handle.post_field_size(data.len() as u64)?;
+                self.headers.append("Content-Type: application/json")?;
+            },
+
+             // Do not set content-type header at all if there is no
+             // body, or if the form handler was invoked above.
+             _ => (),
+        };
+
+        // Configure headers on the request:
+        self.handle.http_headers(self.headers)?;
+
+        {
+            // Take a scoped transfer from the Easy handle. This makes it
+            // possible to write data into the above local buffers without
+            // fighting the borrow-checker:
+            let mut transfer = self.handle.transfer();
+
+            // Write the payload if it exists:
+            match self.body {
+                Body::Bytes { data, .. } => chunked_read_function(&mut transfer, data)?,
+
+                #[cfg(feature = "json")]
+                Body::Json(ref json) => chunked_read_function(&mut transfer, json)?,
+
+                // Do nothing if there is no body or if the body is a
+                // form.
+                _ => (),
+            };
+
+            // Read one header per invocation. Request processing is
+            // terminated if any header is malformed:
+            transfer.header_function(|header| {
+                // Headers are expected to be valid UTF-8 data. If they
+                // are not, the conversion is lossy.
+                //
+                // Technically it is legal for HTTP requests to use
+                // different encodings, but we don't interface with such
+                // services for hygienic reasons.
+                let header = String::from_utf8_lossy(header);
+                let split = header.splitn(2, ':').collect::<Vec<_>>();
+
+                // "Malformed" headers are skipped. In most cases this
+                // will only be the HTTP version statement.
+                if split.len() != 2 {
+                    return true;
+                }
+
+                headers.insert(
+                    split[0].trim().to_string(), split[1].trim().to_string()
+                );
+                true
+            })?;
+
+            // Read the body to the allocated buffer.
+            transfer.write_function(|data| {
+                let len = data.len();
+                body.write_all(data)
+                    .map(|_| len)
+                    .map_err(|_| WriteError::Pause)
+            })?;
+
+            transfer.perform()?;
+        }
+
+        Ok(Response {
+            status: self.handle.response_code()?,
+            headers,
+            body
+        })
+    }
+}
+
+/// Provide a data chunk potentially larger than cURL's initial write
+/// buffer to the data reading callback by tracking the offset off
+/// already written data.
+///
+/// As we manually set the expected upload size, cURL will call the
+/// read callback repeatedly until it has all the data it needs.
+fn chunked_read_function<'easy, 'data>(transfer: &mut Transfer<'easy, 'data>,
+                                       data: &'data [u8]) -> Result<(), curl::Error> {
+    let mut data = data;
+
+    transfer.read_function(move |mut into| {
+        let written = into.write(data)
+            .map_err(|_| ReadError::Abort)?;
+
+        data = &data[written..];
+
+        Ok(written)
+    })
+}
+
+impl <T> Response<T> {
+    /// Check whether the status code of this HTTP response is a
+    /// success (i.e. in the 200-299 range).
+    pub fn is_success(&self) -> bool {
+        self.status >= 200 && self.status < 300
+    }
+
+    /// Check whether a request succeeded using `Request::is_success`
+    /// and let users provide a closure that creates a custom error
+    /// from the request if it did not.
+    ///
+    /// This function exists for convenience to avoid having to write
+    /// repetitive `if !response.is_success() { ... }` blocks.
+    pub fn error_for_status<F, E>(self, closure: F) -> Result<Self, E>
+    where F: FnOnce(Self) -> E {
+        if !self.is_success() {
+            return Err(closure(self))
+        }
+
+        Ok(self)
+    }
+}
+
+impl Response<Vec<u8>> {
+    /// Attempt to parse the HTTP response body as a UTF-8 encoded
+    /// string.
+    pub fn as_string(self) -> Result<Response<String>, FromUtf8Error> {
+        let body = String::from_utf8(self.body)?;
+
+        Ok(Response {
+            body,
+            status: self.status,
+            headers: self.headers,
+        })
+    }
+
+    /// Attempt to deserialize the HTTP response body from JSON.
+    #[cfg(feature = "json")]
+    pub fn as_json<T: DeserializeOwned>(self) -> Result<Response<T>, serde_json::Error> {
+        let deserialized = serde_json::from_slice(&self.body)?;
+
+        Ok(Response {
+            body: deserialized,
+            status: self.status,
+            headers: self.headers,
+        })
+    }
+}
diff --git a/net/crimp/src/tests.rs b/net/crimp/src/tests.rs
new file mode 100644
index 000000000000..6c2bc4f5b37a
--- /dev/null
+++ b/net/crimp/src/tests.rs
@@ -0,0 +1,152 @@
+// All tests expect an httpbin instance to be available at
+// `http://localhost:4662`.
+//
+// This is easily spun up using Docker by running:
+//
+//    docker run --rm -p 4662:80 kennethreitz/httpbin
+
+use super::*;
+use serde_json::{Value, json};
+
+// These tests check whether the correct HTTP method is used in the
+// requests.
+
+#[test]
+fn test_http_get() {
+    let resp = Request::get("http://127.0.0.1:4662/get")
+        .send().expect("failed to send request");
+
+    assert!(resp.is_success(), "request should have succeeded");
+}
+
+#[test]
+fn test_http_delete() {
+    let resp = Request::delete("http://127.0.0.1:4662/delete")
+        .send().expect("failed to send request");
+
+    assert_eq!(200, resp.status, "response status should be 200 OK");
+}
+
+#[test]
+fn test_http_put() {
+    let resp = Request::put("http://127.0.0.1:4662/put")
+        .send().expect("failed to send request");
+
+    assert_eq!(200, resp.status, "response status should be 200 OK");
+}
+
+#[test]
+fn test_http_patch() {
+    let resp = Request::patch("http://127.0.0.1:4662/patch")
+        .send().expect("failed to send request");
+
+    assert_eq!(200, resp.status, "response status should be 200 OK");
+}
+
+// These tests perform various requests with different body payloads
+// and verify that those were received correctly by the remote side.
+
+#[test]
+fn test_http_post() {
+    let body = "test body";
+    let response = Request::post("http://127.0.0.1:4662/post")
+        .user_agent("crimp test suite").expect("failed to set user-agent")
+        .timeout(Duration::from_secs(5)).expect("failed to set request timeout")
+        .body("text/plain", &body.as_bytes())
+        .send().expect("failed to send request")
+        .as_json::<Value>().expect("failed to deserialize response");
+
+    let data = response.body;
+
+    assert_eq!(200, response.status, "response status should be 200 OK");
+
+    assert_eq!(data.get("data").unwrap(), &json!("test body"),
+               "test body should have been POSTed");
+
+    assert_eq!(
+        data.get("headers").unwrap().get("Content-Type").unwrap(),
+        &json!("text/plain"),
+        "Content-Type should be `text/plain`",
+    );
+}
+
+#[cfg(feature = "json")] #[test]
+fn test_http_post_json() {
+    let body = json!({
+        "purpose": "testing!"
+    });
+
+    let response = Request::post("http://127.0.0.1:4662/post")
+        .user_agent("crimp test suite").expect("failed to set user-agent")
+        .timeout(Duration::from_secs(5)).expect("failed to set request timeout")
+        .json(&body).expect("request serialization failed")
+        .send().expect("failed to send request")
+        .as_json::<Value>().expect("failed to deserialize response");
+
+
+    let data = response.body;
+
+    assert_eq!(200, response.status, "response status should be 200 OK");
+
+    assert_eq!(data.get("json").unwrap(), &body,
+               "test body should have been POSTed");
+
+    assert_eq!(
+        data.get("headers").unwrap().get("Content-Type").unwrap(),
+        &json!("application/json"),
+        "Content-Type should be `application/json`",
+    );
+}
+
+// Tests for different authentication methods that are supported
+// out-of-the-box:
+
+#[test]
+fn test_bearer_auth() {
+    let response = Request::get("http://127.0.0.1:4662/bearer")
+        .bearer_auth("some-token").expect("failed to set auth header")
+        .send().expect("failed to send request");
+
+    assert!(response.is_success(), "authorized request should succeed");
+}
+
+#[test]
+fn test_basic_auth() {
+    let request = Request::get("http://127.0.0.1:4662/basic-auth/alan_watts/oneness");
+
+    let response = request
+        .basic_auth("alan_watts", "oneness").expect("failed to set auth header")
+        .send().expect("failed to send request");
+
+    assert!(response.is_success(), "authorized request should succeed");
+}
+
+#[test]
+fn test_large_body() {
+    // By default cURL buffers seem to be 2^16 bytes in size. The test
+    // size is therefore 2^16+1.
+    const BODY_SIZE: usize = 65537;
+
+    let resp = Request::post("http://127.0.0.1:4662/post")
+        .body("application/octet-stream", &[0; BODY_SIZE])
+        .send().expect("sending request")
+        .as_json::<Value>().expect("JSON deserialisation");
+
+    // httpbin returns the uploaded data as a string in the `data`
+    // field.
+    let data = resp.body.get("data").unwrap().as_str().unwrap();
+
+    assert_eq!(BODY_SIZE, data.len(), "uploaded data length should be correct");
+}
+
+// Tests for various other features.
+
+#[test]
+fn test_error_for_status() {
+    let response = Request::get("http://127.0.0.1:4662/patch")
+        .send().expect("failed to send request")
+        .error_for_status(|resp| format!("Response error code: {}", resp.status));
+
+    assert_eq!(Err("Response error code: 405".into()), response,
+               "returned error should be converted into Result::Err");
+}
diff --git a/net/stomp_erl/.gitignore b/net/stomp_erl/.gitignore
new file mode 100644
index 000000000000..8e46d5a07f8f
--- /dev/null
+++ b/net/stomp_erl/.gitignore
@@ -0,0 +1,10 @@
+.eunit
+deps
+*.o
+*.beam
+*.plt
+erl_crash.dump
+ebin
+rel/example_project
+.concrete/DEV_MODE
+.rebar
diff --git a/net/stomp_erl/Makefile b/net/stomp_erl/Makefile
new file mode 100644
index 000000000000..b3bc54673d0b
--- /dev/null
+++ b/net/stomp_erl/Makefile
@@ -0,0 +1,8 @@
+PROJECT = stomp
+PROJECT_DESCRIPTION = STOMP client for Erlang
+PROJECT_VERSION = 0.1.0
+
+# Whitespace to be used when creating files from templates.
+SP = 4
+
+include erlang.mk
diff --git a/net/stomp_erl/README.md b/net/stomp_erl/README.md
new file mode 100644
index 000000000000..21c95a11a2e9
--- /dev/null
+++ b/net/stomp_erl/README.md
@@ -0,0 +1,78 @@
+STOMP on Erlang
+===============
+
+`stomp.erl` is a simple Erlang client for the [STOMP protocol][] in version 1.2.
+
+Currently only subscribing to queues is supported.
+
+It provides an application called `stomp` which takes configuration of the form:
+
+```erlang
+[{stomp, #{host     => "stomp-server.somedomain.sexy", % required
+           port     => 61613,                          % optional
+           login    => <<"someuser">>,                 % optional
+           passcode => <<"hunter2>>,                   % optional
+ }}].
+```
+
+## Types
+
+The following types are used in `stomp.erl`, you can include them from
+`stomp.hrl`:
+
+```erlang
+%% Client ack modes, refer to the STOMP protocol documentation
+-type ack_mode() :: client | client_individual | auto.
+
+%% Subscriptions are enumerated from 0
+-type sub_id() :: integer().
+
+%% Message IDs (for acknowledgements) are simple strings. They are
+%% extracted from the 'ack' field of the header in client or client-individual
+%% mode, and from the 'message-id' field in auto mode.
+-type message_id() :: binary().
+
+%% A STOMP message as received from a queue subscription
+-record(stomp_msg, { headers :: #{ binary() => binary() },
+                     body    :: binary() }.
+-type stomp_msg() :: #stomp_msg{}.
+```
+
+Once the application starts it will register a process under the name
+`stomp_worker` and expose the following API:
+
+## Subscribing to a queue
+
+```erlang
+%% Subscribe to a destination, receive the subscription ID
+-spec subscribe(binary(),   % Destination (e.g. <<"/queue/lizards">>)
+                ack_mode(), % Client-acknowledgement mode
+                -> {ok, sub_id()}.
+```
+
+This synchronous call subscribes to a message queue. The `stomp_worker` will
+link itself to the caller and forward received messages as
+`{msg, sub_id(), stomp_msg()}`.
+
+Depending on the acknowledgement mode specified on connecting, the subscriber
+may have to acknowledge receival of messages.
+
+## Acknowledging messages
+
+```erlang
+%% Acknowledge a message ID.
+%% This is not required in auto mode. In client mode it will acknowledge the
+%% received messages up to the ID specified. In client-individual mode every
+%% single message has to be acknowledged.
+-spec ack(sub_id(), message_id()) -> ok.
+
+%% Explicitly "unacknowledge" a message
+-spec nack(sub_id(), message_id()) -> ok.
+```
+
+Both of these calls are asynchronous and will return immediately. Note that in
+the case of the `stomp_worker` crashing before a message acknowledgement is
+handled, the message *may* be delivered again. Your consumer needs to be able to
+handle this.
+
+[STOMP protocol]: https://stomp.github.io/stomp-specification-1.2.html
diff --git a/net/stomp_erl/include/stomp.hrl b/net/stomp_erl/include/stomp.hrl
new file mode 100644
index 000000000000..30c933b56302
--- /dev/null
+++ b/net/stomp_erl/include/stomp.hrl
@@ -0,0 +1,22 @@
+%% Client ack modes, refer to the STOMP protocol documentation
+-type ack_mode() :: client | client_individual | auto.
+
+%% Subscriptions are enumerated from 0
+-type sub_id() :: integer().
+
+%% Message IDs (for acknowledgements) are simple strings. They are
+%% extracted from the 'ack' field of the header in client or client-individual
+%% mode, and from the 'message-id' field in auto mode.
+-type message_id() :: binary().
+
+%% A destination can be a queue, or something else.
+%% Example: <<"/queue/lizards">>
+-type destination() :: binary().
+
+%% A STOMP message as received from a queue subscription
+-record(stomp_msg, { headers :: #{ binary() => binary() },
+                     body    :: binary() }).
+-type stomp_msg() :: #stomp_msg{}.
+
+%% STOMP frame components
+-type headers() :: #{binary() => binary()}.
diff --git a/net/stomp_erl/src/stomp.app.src b/net/stomp_erl/src/stomp.app.src
new file mode 100644
index 000000000000..baf0e271d1f0
--- /dev/null
+++ b/net/stomp_erl/src/stomp.app.src
@@ -0,0 +1,7 @@
+{application, stomp, [{description, "STOMP client for Erlang"},
+                      {vsn, "0.1.0"},
+                      {modules, [stomp_app, stomp_sup, stomp_worker]},
+                      {registered, [stomp_worker]},
+                      {env, []},
+                      {applications, [kernel, stdlib]},
+                      {mod, {stomp_app, []}}]}.
diff --git a/net/stomp_erl/src/stomp_app.erl b/net/stomp_erl/src/stomp_app.erl
new file mode 100644
index 000000000000..2ba3e69f992a
--- /dev/null
+++ b/net/stomp_erl/src/stomp_app.erl
@@ -0,0 +1,11 @@
+-module(stomp_app).
+-behaviour(application).
+
+-export([start/2]).
+-export([stop/1]).
+
+start(_Type, _Args) ->
+    stomp_sup:start_link().
+
+stop(_State) ->
+    ok.
diff --git a/net/stomp_erl/src/stomp_sup.erl b/net/stomp_erl/src/stomp_sup.erl
new file mode 100644
index 000000000000..3a298bc9bf8b
--- /dev/null
+++ b/net/stomp_erl/src/stomp_sup.erl
@@ -0,0 +1,22 @@
+-module(stomp_sup).
+-behaviour(supervisor).
+
+-export([start_link/0]).
+-export([init/1]).
+
+start_link() ->
+    supervisor:start_link({local, ?MODULE}, ?MODULE, []).
+
+init([]) ->
+    Procs = [stomp_spec()],
+    {ok, {{one_for_one, 1, 5}, Procs}}.
+
+%% Private
+
+stomp_spec() ->
+    #{id       => stomp_proc,
+      start    => {stomp_worker, start_link, []},
+      restart  => permanent,
+      shutdown => 5000,
+      type     => worker,
+      module   => [stomp_worker]}.
diff --git a/net/stomp_erl/src/stomp_worker.erl b/net/stomp_erl/src/stomp_worker.erl
new file mode 100644
index 000000000000..80981d37ab52
--- /dev/null
+++ b/net/stomp_erl/src/stomp_worker.erl
@@ -0,0 +1,193 @@
+-module(stomp_worker).
+-behaviour(gen_server).
+
+%% API.
+-export([start_link/0]).
+
+%% gen_server.
+-export([init/1]).
+-export([handle_call/3]).
+-export([handle_cast/2]).
+-export([handle_info/2]).
+-export([terminate/2]).
+-export([code_change/3]).
+
+%% Testing
+-compile(export_all).
+
+-include("stomp.hrl").
+
+%% State of a stomp_worker
+-record(state, {connection    :: port(),
+                next_sub      :: sub_id(),
+                subscriptions :: #{ destination() => sub_id() },
+                subscribers   :: #{ destination() => pid() }
+               }).
+-type state() :: #state{}.
+
+%% API implementation
+
+-spec start_link() -> {ok, pid()}.
+start_link() ->
+    {ok, Pid} = gen_server:start_link(?MODULE, [], []),
+    register(?MODULE, Pid),
+    {ok, Pid}.
+
+%% gen_server implementation
+
+-spec init(any()) -> {ok, state()}.
+init(_Args) ->
+    %% Fetch configuration from app config
+    {ok, Host} = application:get_env(stomp, host),
+    Port = application:get_env(stomp, port, 61613),
+    Login = application:get_env(stomp, login),
+    Pass = application:get_env(stomp, passcode),
+
+    %% Catch exit signals from linked processes (subscribers dying)
+    process_flag(trap_exit, true),
+
+    %% Establish connection
+    {ok, Conn} = connect(Host, Port, Login, Pass),
+
+    {ok, #state{connection = Conn,
+                next_sub   = 0,
+                subscriptions = #{},
+                subscribers = #{}}}.
+
+%% Handle subscription calls
+handle_call({subscribe, Dest, Ack}, From, State) ->
+    %% Subscribe to new destination
+    SubId = State#state.next_sub,
+    ok = subscribe(State#state.connection, SubId, Dest, Ack),
+
+    %% Add subscription and subscriber to state
+    Subscriptions = maps:put(SubId, Dest, State#state.subscriptions),
+    Subscribers = maps:put(SubId, From, State#state.subscribers),
+    NextSub = SubId + 1,
+    NewState = State#state{subscriptions = Subscriptions,
+                           subscribers = Subscribers,
+                           next_sub = NextSub },
+
+    {reply, {ok, SubId}, NewState};
+handle_call(_Req, _From, State) ->
+    {reply, ignored, State}.
+
+handle_info({tcp, Conn, Frame}, State) when Conn =:= State#state.connection ->
+    handle_frame(Frame, State);
+handle_info(_Msg, State) ->
+    {noreply, State}.
+
+%% Unused gen_server callbacks
+
+handle_cast(_Msg, State) ->
+    {noreply, State}.
+
+terminate(_Reason, _State) ->
+    ok.
+
+code_change(_OldVsn, State, _Extra) ->
+    {ok, State}.
+
+%% Private functions
+
+-spec connect(list(), integer(), any(), any()) -> {ok, port()}.
+connect(Host, Port, Login, Pass) ->
+    %% STOMP CONNECT frame
+    Connect = connect_frame(Host, Login, Pass),
+
+    %% TODO: Configurable buffer size
+    %% Frames larger than the user-level buffer will be truncated, so it should
+    %% never be smaller than the largest expected messages.
+    {ok, Socket} = gen_tcp:connect(Host, Port, [binary,
+                                                {packet, line},
+                                                {line_delimiter, $\0},
+                                                {buffer, 262144}]),
+
+    ok = gen_tcp:send(Socket, Connect),
+    {ok, Socket}.
+
+-spec subscribe(port(), sub_id(), destination(), ack_mode()) -> ok.
+subscribe(Socket, Id, Queue, Ack) ->
+    {ok, SubscribeFrame} = subscribe_frame(Id, Queue, Ack),
+    gen_tcp:send(Socket, SubscribeFrame).
+
+%%% Parsing STOMP frames
+
+handle_frame(<<"MESSAGE", "\n", _Frame/binary>>, State) ->
+    {noreply, State};
+handle_frame(Frame, State) ->
+    io:format("Received unknown frame ~p", [Frame]),
+    {noreply, State}.
+
+
+%% Parse out headers into a map
+-spec parse_headers(binary()) -> headers().
+parse_headers(HeadersBin) ->
+    Headers = binary:split(HeadersBin, <<"\n">>, [global]),
+    ToPairs = fun(H, M) -> [K,V | []] = binary:split(H, <<":">>),
+                           maps:put(K, V, M)
+              end,
+    {ok, lists:mapfoldl(ToPairs, #{}, Headers)}.
+
+%%% Making STOMP protocol frames
+
+%% Format a header
+-spec format_header({binary(), binary()}) -> binary().
+format_header({Key, Val}) ->
+    <<Key/binary, ":", Val/binary, "\n">>.
+
+%% Build a single STOMP frame
+-spec make_frame(binary(),
+                 headers(),
+                 binary())
+                -> {ok, iolist()}.
+make_frame(Command, HeaderMap, Body) ->
+    Headers = lists:map(fun format_header/1, maps:to_list(HeaderMap)),
+    Frame = [Command, <<"\n">>, Headers, <<"\n">>, Body, <<0>>],
+    {ok, Frame}.
+
+%%% Default frames
+
+-spec connect_frame(list(), any(), any()) -> iolist().
+connect_frame(Host, {ok, Login}, {ok, Pass}) ->
+    make_frame(<<"CONNECT">>,
+               #{<<"accept-version">> => <<"1.2">>,
+                 <<"host">>           => Host,
+                 <<"login">>          => Login,
+                 <<"passcode">>       => Pass,
+                 <<"heart-beat">>     => <<"0,5000">>},
+               []);
+connect_frame(Host, _Login, _Pass) ->
+    make_frame(<<"CONNECT">>,
+               #{<<"accept-version">> => <<"1.2">>,
+                 <<"host">>           => Host,
+                 %% Expect a server heartbeat every 5 seconds, let the server
+                 %% expect one every 10. We don't actually check this and just
+                 %% echo server heartbeats.
+                 %% TODO: For now the server is told not to expect replies due to
+                 %% a weird behaviour.
+                 <<"heart-beat">>     => <<"0,5000">>},
+               []).
+
+
+-spec subscribe_frame(sub_id(), destination(), ack_mode()) -> iolist().
+subscribe_frame(Id, Queue, Ack) ->
+    make_frame(<<"SUBSCRIBE">>,
+               #{<<"id">>          => integer_to_binary(Id),
+                 <<"destination">> => Queue,
+                 <<"ack">>         => ack_mode_to_binary(Ack)},
+               []).
+
+-spec ack_mode_to_binary(ack_mode()) -> binary().
+ack_mode_to_binary(AckMode) ->
+    case AckMode of
+        auto              -> <<"auto">>;
+        client            -> <<"client">>;
+        client_individual -> <<"client-individual">>
+    end.
+
+%% -spec ack_frame(binary()) -> iolist().
+%% ack_frame(MessageID) ->
+%%     make_frame(<<"ACK">>,
+%%                [{"id", MessageID}],
+%%                []).