From 1239ee3dad952c20f6041ded93c704444b45f603 Mon Sep 17 00:00:00 2001 From: Joakim Hulthe Date: Thu, 18 Mar 2021 18:37:44 +0100 Subject: [PATCH] Rewrite in Rust --- .dockerignore | 2 + .gitignore | 1 + Cargo.lock | 839 +++++++++++++++++++++++++++++++++++++++++++++++ Cargo.toml | 14 + Dockerfile | 27 +- LICENSE | 386 +++++++++++++++++++++- README.md | 4 +- default.template | 26 -- src/main.rs | 103 ++++++ 9 files changed, 1352 insertions(+), 50 deletions(-) create mode 100644 .dockerignore create mode 100644 .gitignore create mode 100644 Cargo.lock create mode 100644 Cargo.toml delete mode 100644 default.template create mode 100644 src/main.rs diff --git a/.dockerignore b/.dockerignore new file mode 100644 index 0000000..80d9b83 --- /dev/null +++ b/.dockerignore @@ -0,0 +1,2 @@ +Dockerfile +target diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..ea8c4bf --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +/target diff --git a/Cargo.lock b/Cargo.lock new file mode 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+name = "winapi-i686-pc-windows-gnu" +version = "0.4.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6" + +[[package]] +name = "winapi-x86_64-pc-windows-gnu" +version = "0.4.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f" diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..a0bee6d --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,14 @@ +[package] +name = "curl_sh" +version = "1.0.0" +authors = ["Joakim Hulthe "] +edition = "2018" + +[dependencies] +hyper = { version = "0.14", features = ["full"] } +tokio = { version = "1", features = ["full"] } +structopt = "0.3.21" +compound-error = "0.1.2" +log = "0.4" +femme = "2" +kv-log-macro = "1" diff --git a/Dockerfile b/Dockerfile index 19044b0..55601c8 100644 --- a/Dockerfile +++ b/Dockerfile @@ -1,12 +1,25 @@ -FROM nginx:alpine +################### +### BUILD STAGE ### +################### +FROM rust:1.47 as build_stage -EXPOSE 80 +# Install build dependencies +RUN rustup target add x86_64-unknown-linux-musl -ENV PROXY_PASS_HOST=http://example.com +# Build project +WORKDIR /app +COPY . . +RUN cargo build --release --target x86_64-unknown-linux-musl +RUN strip target/x86_64-unknown-linux-musl/release/curl_sh -COPY default.template /etc/nginx/conf.d/default.template +######################## +### PRODUCTION STAGE ### +######################## +FROM scratch -COPY script.sh /usr/share/nginx/script.sh +WORKDIR / -CMD envsubst '$PROXY_PASS_HOST' < etc/nginx/conf.d/default.template > /etc/nginx/conf.d/default.conf && \ - nginx -g 'daemon off;' +# Copy application binary +COPY --from=build_stage /app/target/x86_64-unknown-linux-musl/release/curl_sh curl_sh + +CMD ["/curl_sh"] diff --git a/LICENSE b/LICENSE index 1a647ba..14e2f77 100644 --- a/LICENSE +++ b/LICENSE @@ -1,19 +1,373 @@ -Copyright (c) 2018 Joakim Hulthe +Mozilla Public License Version 2.0 +================================== -Permission is hereby granted, free of charge, to any person obtaining a copy -of this software and associated documentation files (the "Software"), to deal -in the Software without restriction, including without limitation the rights -to use, copy, modify, merge, publish, distribute, sublicense, and/or sell -copies of the Software, and to permit persons to whom the Software is -furnished to do so, subject to the following conditions: +1. Definitions +-------------- -The above copyright notice and this permission notice shall be included in all -copies or substantial portions of the Software. +1.1. "Contributor" + means each individual or legal entity that creates, contributes to + the creation of, or owns Covered Software. -THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR -IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, -FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE -AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER -LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, -OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE -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. diff --git a/README.md b/README.md index 6c251be..3a3bc15 100644 --- a/README.md +++ b/README.md @@ -2,9 +2,11 @@ curl\_sh ======== _A User-Agent based proxy_ -This nginx configuration will return `script.sh` if the user-agent matches "**curl**". +This nginx configuration will return `script.sh` if the user-agent contains "**curl**". In any other case it will act as a reverse-proxy to `PROXY_PASS_HOST`. +curl\_sh does not support HTTPS. + ### Usage ```sh diff --git a/default.template b/default.template deleted file mode 100644 index 226a1db..0000000 --- a/default.template +++ /dev/null @@ -1,26 +0,0 @@ -server { - listen 80; - server_name _; - - #charset koi8-r; - #access_log /var/log/nginx/host.access.log main; - - location / { - error_page 418 = @pass; - recursive_error_pages on; - if ( $http_user_agent !~ 'curl' ) { - return 418; - } - - root /usr/share/nginx; - try_files /script.sh =404; - } - - location @pass { - proxy_pass $PROXY_PASS_HOST; - proxy_set_header Host $host; - proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; - proxy_redirect default; - } -} - diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..dcf8ba4 --- /dev/null +++ b/src/main.rs @@ -0,0 +1,103 @@ +use compound_error::CompoundError; +use hyper::service::{make_service_fn, service_fn}; +use hyper::{Body, Client, Request, Response, Server, Uri}; +use kv_log_macro::info; +use log::error; +use std::net::SocketAddr; +use std::path::PathBuf; +use structopt::StructOpt; +use tokio::fs; + +#[derive(StructOpt)] +struct Opt { + #[structopt(short, long)] + file: PathBuf, + + #[structopt(short, long)] + user_agent: String, + + #[structopt(short, long)] + proxy_pass: String, +} + +#[derive(Debug, CompoundError)] +enum Error { + Hyper(hyper::Error), + IO(std::io::Error), +} + +async fn proxy_pass(mut req: Request, opt: &Opt) -> Result, Error> { + let user_agent: Option = req + .headers() + .get("User-Agent") + .and_then(|h| h.to_str().ok()) + .map(|s| s.to_string()); + + let user_agent_matches = user_agent + .as_ref() + .map(|user_agent| user_agent.contains(&opt.user_agent)) + .unwrap_or(false); + + let req_uri = req.uri().clone(); + + let mut error = None; + + let response = if user_agent_matches { + let file = fs::read_to_string(&opt.file).await?; + Response::new(file.into()) + } else { + let proxy_uri: Uri = opt.proxy_pass.parse().expect("proxy uri"); + + let mut new_uri = Uri::builder().authority(proxy_uri.authority().unwrap().clone()); + + new_uri = new_uri.scheme(proxy_uri.scheme_str().unwrap_or("http")); + + if let Some(paq) = req_uri.path_and_query().cloned() { + new_uri = new_uri.path_and_query(paq); + } + + *req.uri_mut() = new_uri.build().expect("uri"); + + let client = Client::new(); + match client.request(req).await { + Ok(response) => response, + Err(e) => { + error = Some(e); + Response::builder() + .status(503) + .body("503 Service Unavailable".into()) + .unwrap() + } + } + }; + + info!("request received", { + user_agent: format!("{:?}", user_agent).as_str(), + pattern: opt.user_agent.as_str(), + matches: user_agent_matches, + uri: format!("{}", req_uri).as_str(), + error: format!("{:?}", error).as_str(), + }); + + Ok(response) +} + +#[tokio::main] +async fn main() { + let opt: &'static Opt = Box::leak(Box::new(Opt::from_args())); + + femme::start(); + + let addr = SocketAddr::from(([0, 0, 0, 0], 3000)); + + let make_svc = + make_service_fn( + |_conn| async move { Ok::<_, Error>(service_fn(move |r| proxy_pass(r, opt))) }, + ); + + let server = Server::bind(&addr).serve(make_svc); + + if let Err(e) = server.await { + error!("server error: {}", e); + } +}