Add protocol for authenticating a unix socket
This commit is contained in:
parent
dc29dd274a
commit
20e60ca5c7
GPG Key ID:
9F2F7D8250F35146
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@ -99,6 +99,21 @@ version = "1.0.82"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "f538837af36e6f6a9be0faa67f9a314f8119e4e4b5867c6ab40ed60360142519"
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[[package]]
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name = "async-bincode"
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version = "0.7.2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "21849a990d47109757e820904d7c0b569a8013f6595bf14d911884634d58795f"
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dependencies = [
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"bincode",
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"byteorder",
|
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"bytes",
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"futures-core",
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"futures-sink",
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"serde",
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"tokio",
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]
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[[package]]
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name = "atoi"
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version = "2.0.0"
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@ -141,6 +156,15 @@ version = "1.6.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "8c3c1a368f70d6cf7302d78f8f7093da241fb8e8807c05cc9e51a125895a6d5b"
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[[package]]
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name = "bincode"
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version = "1.3.3"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "b1f45e9417d87227c7a56d22e471c6206462cba514c7590c09aff4cf6d1ddcad"
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dependencies = [
|
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"serde",
|
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]
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[[package]]
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name = "bitflags"
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version = "1.3.2"
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@ -555,6 +579,21 @@ dependencies = [
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"percent-encoding",
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]
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[[package]]
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name = "futures"
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version = "0.3.30"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "645c6916888f6cb6350d2550b80fb63e734897a8498abe35cfb732b6487804b0"
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dependencies = [
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"futures-channel",
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"futures-core",
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"futures-executor",
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"futures-io",
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"futures-sink",
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"futures-task",
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"futures-util",
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]
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[[package]]
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name = "futures-channel"
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version = "0.3.30"
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@ -599,6 +638,17 @@ version = "0.3.30"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "a44623e20b9681a318efdd71c299b6b222ed6f231972bfe2f224ebad6311f0c1"
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[[package]]
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name = "futures-macro"
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version = "0.3.30"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "87750cf4b7a4c0625b1529e4c543c2182106e4dedc60a2a6455e00d212c489ac"
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dependencies = [
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"proc-macro2",
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"quote",
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"syn 2.0.60",
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]
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[[package]]
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name = "futures-sink"
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version = "0.3.30"
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@ -617,8 +667,10 @@ version = "0.3.30"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "3d6401deb83407ab3da39eba7e33987a73c3df0c82b4bb5813ee871c19c41d48"
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dependencies = [
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"futures-channel",
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"futures-core",
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"futures-io",
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"futures-macro",
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"futures-sink",
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"futures-task",
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"memchr",
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@ -906,20 +958,27 @@ name = "mysqladm-rs"
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version = "0.1.0"
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dependencies = [
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"anyhow",
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"async-bincode",
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"bincode",
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"clap",
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"dialoguer",
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"env_logger",
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"futures",
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"indoc",
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"itertools",
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"log",
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"nix",
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"prettytable",
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"rand",
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"ratatui",
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"serde",
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"serde_json",
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"sqlx",
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"thiserror",
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"tokio",
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"tokio-util",
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"toml",
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"uuid",
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]
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[[package]]
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@ -1812,18 +1871,18 @@ dependencies = [
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[[package]]
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name = "thiserror"
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version = "1.0.58"
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version = "1.0.63"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "03468839009160513471e86a034bb2c5c0e4baae3b43f79ffc55c4a5427b3297"
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checksum = "c0342370b38b6a11b6cc11d6a805569958d54cfa061a29969c3b5ce2ea405724"
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dependencies = [
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"thiserror-impl",
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]
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[[package]]
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name = "thiserror-impl"
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version = "1.0.58"
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version = "1.0.63"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "c61f3ba182994efc43764a46c018c347bc492c79f024e705f46567b418f6d4f7"
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checksum = "a4558b58466b9ad7ca0f102865eccc95938dca1a74a856f2b57b6629050da261"
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dependencies = [
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"proc-macro2",
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"quote",
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@ -1883,6 +1942,19 @@ dependencies = [
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"tokio",
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]
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[[package]]
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name = "tokio-util"
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version = "0.7.11"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "9cf6b47b3771c49ac75ad09a6162f53ad4b8088b76ac60e8ec1455b31a189fe1"
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dependencies = [
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"bytes",
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"futures-core",
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"futures-sink",
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"pin-project-lite",
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"tokio",
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]
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[[package]]
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name = "toml"
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version = "0.8.12"
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@ -2023,6 +2095,15 @@ version = "0.2.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "711b9620af191e0cdc7468a8d14e709c3dcdb115b36f838e601583af800a370a"
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[[package]]
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name = "uuid"
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version = "1.10.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "81dfa00651efa65069b0b6b651f4aaa31ba9e3c3ce0137aaad053604ee7e0314"
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dependencies = [
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"getrandom",
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]
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[[package]]
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name = "vcpkg"
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version = "0.2.15"
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@ -5,20 +5,27 @@ edition = "2021"
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[dependencies]
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anyhow = "1.0.82"
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async-bincode = "0.7.2"
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bincode = "1.3.3"
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clap = { version = "4.5.4", features = ["derive"] }
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dialoguer = "0.11.0"
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env_logger = "0.11.3"
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futures = "0.3.30"
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indoc = "2.0.5"
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itertools = "0.12.1"
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log = "0.4.21"
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nix = { version = "0.28.0", features = ["user"] }
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nix = { version = "0.28.0", features = ["fs", "user"] }
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prettytable = "0.10.0"
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rand = "0.8.5"
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ratatui = { version = "0.26.2", optional = true }
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serde = "1.0.198"
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serde_json = { version = "1.0.116", features = ["preserve_order"] }
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sqlx = { version = "0.7.4", features = ["runtime-tokio", "mysql", "tls-rustls"] }
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thiserror = "1.0.63"
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tokio = { version = "1.37.0", features = ["rt", "macros"] }
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tokio-util = "0.7.11"
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toml = "0.8.12"
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uuid = { version = "1.10.0", features = ["v4"] }
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[features]
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default = ["mysql-admutils-compatibility"]
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@ -0,0 +1,454 @@
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//! This module provides a way to authenticate a client uid to a server over a Unix socket.
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//! This is needed so that the server can trust the client's uid, which it depends on to
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//! make modifications for that user in the database. It is crucial that the server can trust
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//! that the client is the unix user it claims to be.
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//!
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//! This works by having the client respond to a challenge on a socket that is verifiably owned
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//! by the client. In more detailed steps, the following should happen:
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//!
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//! 1. Before initializing it's request, the client should open an "authentication" socket with permissions 644
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//! and owned by the uid of the current user.
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//! 2. The client opens a request to the server on the "normal" socket where the server is listening,
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//! In this request, the client should include the following:
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//! - The address of it's authentication socket
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//! - The uid of the user currently using the client
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//! - A challenge string that has been randomly generated
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//! 3. The server validates the following:
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//! - The address of the auth socket is valid
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//! - The owner of the auth socket address is the same as the uid
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//! 4. Server connects to the auth socket address and receives another challenge string.
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//! The server should close the connection after receiving the challenge string.
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//! 5. Server verifies that the challenge is the same as the one it originally received.
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//! It responds to the client with an "Authenticated" message if the challenge matches,
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//! or an error message if it does not.
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//! 6. Client closes the authentication socket. Normal socket is used for communication.
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//!
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//! Note that the server can at any point in the process send an error message to the client
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//! over it's initial connection, and the client should respond by closing the authentication
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//! socket, it's connection to the normal socket, and reporting the error to the user.
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//!
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//! Also note that it is essential that the client does not send any sensitive information
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//! over it's authentication socket, since it is readable by any user on the system.
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use std::os::unix::io::AsRawFd;
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use std::path::PathBuf;
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use async_bincode::{tokio::AsyncBincodeStream, AsyncDestination};
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use futures::{SinkExt, StreamExt};
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use nix::{sys::stat, unistd::Uid};
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use rand::distributions::Alphanumeric;
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use rand::Rng;
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use serde::{Deserialize, Serialize};
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use tokio::net::{UnixListener, UnixStream};
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use tokio_util::sync::CancellationToken;
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#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
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pub enum ClientRequest {
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Initialize {
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uid: u32,
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challenge: u64,
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auth_socket: String,
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},
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Cancel,
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}
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#[derive(Debug, Clone, PartialEq, Serialize, Deserialize)]
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pub enum ServerResponse {
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Authenticated,
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ChallengeDidNotMatch,
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ServerError(ServerError),
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}
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// TODO: wrap more data into the errors
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#[derive(Debug, PartialEq, Serialize, Deserialize, Clone)]
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pub enum ServerError {
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InvalidRequest,
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UnableToReadPermissionsFromAuthSocket,
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CouldNotConnectToAuthSocket,
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AuthSocketClosedEarly,
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UidMismatch,
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ChallengeMismatch,
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InvalidChallenge,
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}
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#[derive(Debug, PartialEq)]
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pub enum ClientError {
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UnableToConnectToServer,
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UnableToOpenAuthSocket,
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UnableToConfigureAuthSocket,
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AuthSocketClosedEarly,
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UnableToCloseAuthSocket,
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AuthenticationError,
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InvalidServerResponse(ServerResponse),
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UnableToParseServerResponse,
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NoServerResponse,
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ServerError(ServerError),
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}
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async fn create_auth_socket(socket_addr: &str) -> Result<UnixListener, ClientError> {
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let auth_socket =
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UnixListener::bind(socket_addr).map_err(|_err| ClientError::UnableToOpenAuthSocket)?;
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stat::fchmod(
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auth_socket.as_raw_fd(),
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stat::Mode::S_IRUSR | stat::Mode::S_IWUSR | stat::Mode::S_IRGRP,
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)
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.map_err(|_err| ClientError::UnableToConfigureAuthSocket)?;
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Ok(auth_socket)
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}
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type ClientToServerStream<'a> =
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AsyncBincodeStream<&'a mut UnixStream, ServerResponse, ClientRequest, AsyncDestination>;
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type ServerToClientStream<'a> =
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AsyncBincodeStream<&'a mut UnixStream, ClientRequest, ServerResponse, AsyncDestination>;
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// TODO: make the challenge constant size and use socket directly, this is overkill
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type AuthStream<'a> = AsyncBincodeStream<&'a mut UnixStream, u64, u64, AsyncDestination>;
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// TODO: add timeout
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const AUTH_SOCKET_NAME: &str = "mysqladm-rs-cli-auth.sock";
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pub async fn client_authenticate(
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normal_socket: &mut UnixStream,
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#[cfg(not(test))] auth_socket_dir: Option<PathBuf>,
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#[cfg(test)] auth_socket_file: Option<PathBuf>,
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) -> Result<(), ClientError> {
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let random_prefix: String = rand::thread_rng()
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.sample_iter(&Alphanumeric)
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.take(16)
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.map(char::from)
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.collect();
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let socket_name = format!("{}-{}", random_prefix, AUTH_SOCKET_NAME);
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#[cfg(not(test))]
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let auth_socket_address = match auth_socket_dir {
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Some(dir) => dir.join(socket_name).to_str().unwrap().to_string(),
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None => std::env::temp_dir()
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.join(socket_name)
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.to_str()
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.unwrap()
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.to_string(),
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};
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#[cfg(test)]
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let auth_socket_address = match auth_socket_file {
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Some(file) => file.to_str().unwrap().to_string(),
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None => std::env::temp_dir()
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.join(socket_name)
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.to_str()
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.unwrap()
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.to_string(),
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};
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client_authenticate_with_auth_socket_address(normal_socket, &auth_socket_address).await
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}
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async fn client_authenticate_with_auth_socket_address(
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normal_socket: &mut UnixStream,
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auth_socket_address: &str,
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) -> Result<(), ClientError> {
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let auth_socket = create_auth_socket(auth_socket_address).await?;
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let result =
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client_authenticate_with_auth_socket(normal_socket, auth_socket, auth_socket_address).await;
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std::fs::remove_file(auth_socket_address)
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.map_err(|_err| ClientError::UnableToCloseAuthSocket)?;
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result
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}
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async fn client_authenticate_with_auth_socket(
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normal_socket: &mut UnixStream,
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auth_socket: UnixListener,
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auth_socket_address: &str,
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) -> Result<(), ClientError> {
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let challenge = rand::random::<u64>();
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let uid = nix::unistd::getuid();
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let mut normal_socket: ClientToServerStream =
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AsyncBincodeStream::from(normal_socket).for_async();
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let challenge_replier_cancellation_token = CancellationToken::new();
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let challenge_replier_cancellation_token_clone = challenge_replier_cancellation_token.clone();
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let challenge_replier_handle = tokio::spawn(async move {
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loop {
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tokio::select! {
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socket = auth_socket.accept() =>
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{
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match socket {
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Ok((mut conn, _addr)) => {
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let mut stream: AuthStream = AsyncBincodeStream::from(&mut conn).for_async();
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stream.send(challenge).await.ok();
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stream.close().await.ok();
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}
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Err(_err) => return Err(ClientError::AuthSocketClosedEarly),
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}
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}
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_ = challenge_replier_cancellation_token_clone.cancelled() => {
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break Ok(());
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}
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}
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}
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});
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let client_hello = ClientRequest::Initialize {
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uid: uid.into(),
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challenge,
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auth_socket: auth_socket_address.to_string(),
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};
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normal_socket
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.send(client_hello)
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.await
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.map_err(|err| match *err {
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bincode::ErrorKind::Io(_err) => ClientError::UnableToConnectToServer,
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_ => ClientError::NoServerResponse,
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})?;
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match normal_socket.next().await {
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Some(Ok(ServerResponse::Authenticated)) => {}
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Some(Ok(ServerResponse::ChallengeDidNotMatch)) => {
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return Err(ClientError::AuthenticationError)
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}
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Some(Ok(ServerResponse::ServerError(err))) => return Err(ClientError::ServerError(err)),
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Some(Err(err)) => match *err {
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bincode::ErrorKind::Io(_err) => return Err(ClientError::NoServerResponse),
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_ => return Err(ClientError::UnableToParseServerResponse),
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},
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None => return Err(ClientError::NoServerResponse),
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}
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challenge_replier_cancellation_token.cancel();
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challenge_replier_handle.await.ok();
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Ok(())
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}
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macro_rules! report_server_error_and_return {
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($normal_socket:expr, $err:expr) => {{
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$normal_socket
|
||||
.send(ServerResponse::ServerError($err))
|
||||
.await
|
||||
.ok();
|
||||
return Err($err);
|
||||
}};
|
||||
}
|
||||
|
||||
async fn server_authenticate(
|
||||
normal_socket: &mut UnixStream,
|
||||
#[cfg(test)] unix_user_uid: Option<u32>,
|
||||
) -> Result<Uid, ServerError> {
|
||||
let mut normal_socket: ServerToClientStream =
|
||||
AsyncBincodeStream::from(normal_socket).for_async();
|
||||
|
||||
let (uid, challenge, auth_socket) = match normal_socket.next().await {
|
||||
Some(Ok(ClientRequest::Initialize {
|
||||
uid,
|
||||
challenge,
|
||||
auth_socket,
|
||||
})) => (uid, challenge, auth_socket),
|
||||
// TODO: more granular errros
|
||||
_ => report_server_error_and_return!(normal_socket, ServerError::InvalidRequest),
|
||||
};
|
||||
|
||||
#[cfg(test)]
|
||||
let auth_socket_uid = match unix_user_uid {
|
||||
Some(uid) => uid,
|
||||
None => report_server_error_and_return!(
|
||||
normal_socket,
|
||||
ServerError::UnableToReadPermissionsFromAuthSocket
|
||||
),
|
||||
};
|
||||
|
||||
#[cfg(not(test))]
|
||||
let auth_socket_uid = match stat::stat(auth_socket.as_str()) {
|
||||
Ok(stat) => stat.st_uid,
|
||||
Err(_err) => report_server_error_and_return!(
|
||||
normal_socket,
|
||||
ServerError::UnableToReadPermissionsFromAuthSocket
|
||||
),
|
||||
};
|
||||
|
||||
if uid != auth_socket_uid {
|
||||
report_server_error_and_return!(normal_socket, ServerError::UidMismatch);
|
||||
}
|
||||
|
||||
let mut authenticated_unix_socket = match UnixStream::connect(auth_socket).await {
|
||||
Ok(socket) => socket,
|
||||
Err(_err) => {
|
||||
report_server_error_and_return!(normal_socket, ServerError::CouldNotConnectToAuthSocket)
|
||||
}
|
||||
};
|
||||
let mut authenticated_unix_socket: AuthStream =
|
||||
AsyncBincodeStream::from(&mut authenticated_unix_socket).for_async();
|
||||
|
||||
let challenge_2 = match authenticated_unix_socket.next().await {
|
||||
Some(Ok(challenge)) => challenge,
|
||||
Some(Err(_)) => {
|
||||
report_server_error_and_return!(normal_socket, ServerError::InvalidChallenge)
|
||||
}
|
||||
None => report_server_error_and_return!(normal_socket, ServerError::AuthSocketClosedEarly),
|
||||
};
|
||||
|
||||
authenticated_unix_socket.close().await.ok();
|
||||
|
||||
if challenge != challenge_2 {
|
||||
normal_socket
|
||||
.send(ServerResponse::ChallengeDidNotMatch)
|
||||
.await
|
||||
.ok();
|
||||
return Err(ServerError::ChallengeMismatch);
|
||||
}
|
||||
|
||||
normal_socket.send(ServerResponse::Authenticated).await.ok();
|
||||
|
||||
Ok(Uid::from_raw(uid))
|
||||
}
|
||||
|
||||
#[cfg(test)]
|
||||
mod test {
|
||||
use super::*;
|
||||
|
||||
use std::time::Duration;
|
||||
use tokio::time::sleep;
|
||||
|
||||
#[tokio::test]
|
||||
async fn test_valid_authentication() {
|
||||
let (mut client, mut server) = UnixStream::pair().unwrap();
|
||||
|
||||
let client_handle =
|
||||
tokio::spawn(async move { client_authenticate(&mut client, None).await });
|
||||
|
||||
let server_handle = tokio::spawn(async move {
|
||||
let uid = nix::unistd::getuid().into();
|
||||
server_authenticate(&mut server, Some(uid)).await
|
||||
});
|
||||
|
||||
client_handle.await.unwrap().unwrap();
|
||||
server_handle.await.unwrap().unwrap();
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn test_ensure_auth_socket_does_not_exist() {
|
||||
let (mut client, mut server) = UnixStream::pair().unwrap();
|
||||
|
||||
let client_handle = tokio::spawn(async move {
|
||||
client_authenticate_with_auth_socket_address(
|
||||
&mut client,
|
||||
"/tmp/test_auth_socket_does_not_exist.sock",
|
||||
)
|
||||
.await
|
||||
});
|
||||
|
||||
let server_handle = tokio::spawn(async move {
|
||||
let uid = nix::unistd::getuid().into();
|
||||
server_authenticate(&mut server, Some(uid)).await
|
||||
});
|
||||
|
||||
client_handle.await.unwrap().unwrap();
|
||||
server_handle.await.unwrap().unwrap();
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn test_uid_mismatch() {
|
||||
let (mut client, mut server) = UnixStream::pair().unwrap();
|
||||
|
||||
let client_handle = tokio::spawn(async move {
|
||||
let err = client_authenticate(&mut client, None).await;
|
||||
assert_eq!(err, Err(ClientError::ServerError(ServerError::UidMismatch)));
|
||||
});
|
||||
|
||||
let server_handle = tokio::spawn(async move {
|
||||
let uid: u32 = nix::unistd::getuid().into();
|
||||
let err = server_authenticate(&mut server, Some(uid + 1)).await;
|
||||
assert_eq!(err, Err(ServerError::UidMismatch));
|
||||
});
|
||||
|
||||
client_handle.await.unwrap();
|
||||
server_handle.await.unwrap();
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn test_snooping_connection() {
|
||||
let (mut client, mut server) = UnixStream::pair().unwrap();
|
||||
|
||||
let socket_path = std::env::temp_dir().join("socket_to_snoop.sock");
|
||||
let socket_path_clone = socket_path.clone();
|
||||
let client_handle =
|
||||
tokio::spawn(
|
||||
async move { client_authenticate(&mut client, Some(socket_path_clone)).await },
|
||||
);
|
||||
|
||||
while !socket_path.exists() {
|
||||
sleep(std::time::Duration::from_millis(10)).await;
|
||||
}
|
||||
|
||||
let mut snooper = UnixStream::connect(socket_path.clone()).await.unwrap();
|
||||
let mut snooper: AuthStream = AsyncBincodeStream::from(&mut snooper).for_async();
|
||||
let message = snooper.next().await.unwrap().unwrap();
|
||||
|
||||
let mut other_snooper = UnixStream::connect(socket_path.clone()).await.unwrap();
|
||||
let mut other_snooper: AuthStream =
|
||||
AsyncBincodeStream::from(&mut other_snooper).for_async();
|
||||
let other_message = other_snooper.next().await.unwrap().unwrap();
|
||||
|
||||
assert_eq!(message, other_message);
|
||||
|
||||
let third_snooper_handle = tokio::spawn(async move {
|
||||
let mut third_snooper = UnixStream::connect(socket_path.clone()).await.unwrap();
|
||||
let mut third_snooper: AuthStream =
|
||||
AsyncBincodeStream::from(&mut third_snooper).for_async();
|
||||
// NOTE: Should hang
|
||||
third_snooper.send(1234).await.unwrap()
|
||||
});
|
||||
|
||||
sleep(Duration::from_millis(10)).await;
|
||||
|
||||
let server_handle = tokio::spawn(async move {
|
||||
let uid: u32 = nix::unistd::getuid().into();
|
||||
server_authenticate(&mut server, Some(uid)).await
|
||||
});
|
||||
|
||||
client_handle.await.unwrap().unwrap();
|
||||
server_handle.await.unwrap().unwrap();
|
||||
|
||||
third_snooper_handle.abort();
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn test_dead_server() {
|
||||
let (mut client, server) = UnixStream::pair().unwrap();
|
||||
std::mem::drop(server);
|
||||
|
||||
let client_handle = tokio::spawn(async move {
|
||||
let err = client_authenticate(&mut client, None).await;
|
||||
assert_eq!(err, Err(ClientError::UnableToConnectToServer));
|
||||
});
|
||||
|
||||
client_handle.await.unwrap();
|
||||
}
|
||||
|
||||
#[tokio::test]
|
||||
async fn test_no_response_from_server() {
|
||||
let (mut client, server) = UnixStream::pair().unwrap();
|
||||
|
||||
let client_handle = tokio::spawn(async move {
|
||||
let err = client_authenticate(&mut client, None).await;
|
||||
assert_eq!(err, Err(ClientError::NoServerResponse));
|
||||
});
|
||||
|
||||
sleep(Duration::from_millis(200)).await;
|
||||
|
||||
std::mem::drop(server);
|
||||
|
||||
client_handle.await.unwrap();
|
||||
}
|
||||
|
||||
// TODO: Test challenge mismatch
|
||||
// TODO: Test invoking server with junk data
|
||||
}
|
||||
|
|
@ -10,6 +10,7 @@ use crate::cli::mysql_admutils_compatibility::{mysql_dbadm, mysql_useradm};
|
|||
|
||||
use clap::Parser;
|
||||
|
||||
mod authenticated_unix_socket;
|
||||
mod cli;
|
||||
mod core;
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue