Add cargo-deny configuration

deny.toml

@@ -0,0 +1,74 @@
+# This section is considered when running `cargo deny check advisories`
+# More documentation for the advisories section can be found here:
+# https://embarkstudios.github.io/cargo-deny/checks/advisories/cfg.html
+[advisories]
+db-path = "~/.cargo/advisory-db"
+db-urls = ["https://github.com/rustsec/advisory-db"]
+vulnerability = "warn"
+unmaintained = "warn"
+yanked = "warn"
+notice = "warn"
+ignore = [
+    #"RUSTSEC-0000-0000",
+]
+
+# This section is considered when running `cargo deny check licenses`
+# More documentation for the licenses section can be found here:
+# https://embarkstudios.github.io/cargo-deny/checks/licenses/cfg.html
+[licenses]
+unlicensed = "deny"
+allow = [
+    "MIT",
+    "Apache-2.0",
+    "ISC",
+    "BSD-2-Clause",
+    "BSD-3-Clause",
+    "CC0-1.0",
+]
+copyleft = "allow"
+allow-osi-fsf-free = "neither"
+default = "deny"
+confidence-threshold = 0.8
+exceptions = [
+    { allow = ["OpenSSL"], name = "ring" },
+]
+
+[[licenses.clarify]]
+name = "ring"
+# SPDX considers OpenSSL to encompass both the OpenSSL and SSLeay licenses
+# https://spdx.org/licenses/OpenSSL.html
+# ISC - Both BoringSSL and ring use this for their new files
+# MIT - "Files in third_party/ have their own licenses, as described therein. The MIT
+# license, for third_party/fiat, which, unlike other third_party directories, is
+# compiled into non-test libraries, is included below."
+# OpenSSL - Obviously
+expression = "ISC AND MIT AND OpenSSL"
+license-files = [{ path = "LICENSE", hash = 0xbd0eed23 }]
+
+# This section is considered when running `cargo deny check bans`.
+# More documentation about the 'bans' section can be found here:
+# https://embarkstudios.github.io/cargo-deny/checks/bans/cfg.html
+[bans]
+multiple-versions = "deny"
+wildcards = "allow"
+highlight = "all"
+# Certain crates/versions that will be skipped when doing duplicate detection.
+skip = [
+    # duplicated in blake2d_simd / blake3
+    { name = "arrayvec", version = "=0.7.2" },
+    # duplicated in flimit/unix_socket (many others use 1.0.0)
+    { name = "cfg-if", version = "=0.1.10" },
+    # duplicated in ordered-multimap (many others use 0.11.2)
+    { name = "hashbrown", version = "=0.9.1" },
+    # duplicated in kernel32-sys (many others use 0.3.9)
+    { name = "winapi", version = "=0.2.8" },
+]
+
+# This section is considered when running `cargo deny check sources`.
+# More documentation about the 'sources' section can be found here:
+# https://embarkstudios.github.io/cargo-deny/checks/sources/cfg.html
+[sources]
+unknown-registry = "warn"
+unknown-git = "warn"
+allow-registry = ["https://github.com/rust-lang/crates.io-index"]
+allow-git = []