2 files changed, 122 insertions, 0 deletions
diff --git a/crates/credential/cargo-credential-wincred/Cargo.toml b/crates/credential/cargo-credential-wincred/Cargo.toml
new file mode 100644
index 0000000..83c38e8
--- /dev/null
+++ b/crates/credential/cargo-credential-wincred/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "cargo-credential-wincred"
+version = "0.2.0"
+edition = "2021"
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/rust-lang/cargo"
+description = "A Cargo credential process that stores tokens with Windows Credential Manager."
+
+[dependencies]
+cargo-credential = { version = "0.2.0", path = "../cargo-credential" }
+windows-sys = { version = "0.45", features = ["Win32_Foundation", "Win32_Security_Credentials"] }
diff --git a/crates/credential/cargo-credential-wincred/src/main.rs b/crates/credential/cargo-credential-wincred/src/main.rs
new file mode 100644
index 0000000..8ae48f3
--- /dev/null
+++ b/crates/credential/cargo-credential-wincred/src/main.rs
@@ -0,0 +1,111 @@
+//! Cargo registry windows credential process.
+
+use cargo_credential::{Credential, Error};
+use std::ffi::OsStr;
+use std::os::windows::ffi::OsStrExt;
+
+use windows_sys::core::PWSTR;
+use windows_sys::Win32::Foundation::ERROR_NOT_FOUND;
+use windows_sys::Win32::Foundation::FILETIME;
+use windows_sys::Win32::Foundation::TRUE;
+use windows_sys::Win32::Security::Credentials::CredDeleteW;
+use windows_sys::Win32::Security::Credentials::CredReadW;
+use windows_sys::Win32::Security::Credentials::CredWriteW;
+use windows_sys::Win32::Security::Credentials::CREDENTIALW;
+use windows_sys::Win32::Security::Credentials::CRED_PERSIST_LOCAL_MACHINE;
+use windows_sys::Win32::Security::Credentials::CRED_TYPE_GENERIC;
+
+struct WindowsCredential;
+
+/// Converts a string to a nul-terminated wide UTF-16 byte sequence.
+fn wstr(s: &str) -> Vec<u16> {
+    let mut wide: Vec<u16> = OsStr::new(s).encode_wide().collect();
+    if wide.iter().any(|b| *b == 0) {
+        panic!("nul byte in wide string");
+    }
+    wide.push(0);
+    wide
+}
+
+fn target_name(registry_name: &str) -> Vec<u16> {
+    wstr(&format!("cargo-registry:{}", registry_name))
+}
+
+impl Credential for WindowsCredential {
+    fn name(&self) -> &'static str {
+        env!("CARGO_PKG_NAME")
+    }
+
+    fn get(&self, index_url: &str) -> Result<String, Error> {
+        let target_name = target_name(index_url);
+        let p_credential: *mut CREDENTIALW = std::ptr::null_mut() as *mut _;
+        unsafe {
+            if CredReadW(
+                target_name.as_ptr(),
+                CRED_TYPE_GENERIC,
+                0,
+                p_credential as *mut _ as *mut _,
+            ) != TRUE
+            {
+                return Err(
+                    format!("failed to fetch token: {}", std::io::Error::last_os_error()).into(),
+                );
+            }
+            let bytes = std::slice::from_raw_parts(
+                (*p_credential).CredentialBlob,
+                (*p_credential).CredentialBlobSize as usize,
+            );
+            String::from_utf8(bytes.to_vec()).map_err(|_| "failed to convert token to UTF8".into())
+        }
+    }
+
+    fn store(&self, index_url: &str, token: &str, name: Option<&str>) -> Result<(), Error> {
+        let token = token.as_bytes();
+        let target_name = target_name(index_url);
+        let comment = match name {
+            Some(name) => wstr(&format!("Cargo registry token for {}", name)),
+            None => wstr("Cargo registry token"),
+        };
+        let mut credential = CREDENTIALW {
+            Flags: 0,
+            Type: CRED_TYPE_GENERIC,
+            TargetName: target_name.as_ptr() as PWSTR,
+            Comment: comment.as_ptr() as PWSTR,
+            LastWritten: FILETIME {
+                dwLowDateTime: 0,
+                dwHighDateTime: 0,
+            },
+            CredentialBlobSize: token.len() as u32,
+            CredentialBlob: token.as_ptr() as *mut u8,
+            Persist: CRED_PERSIST_LOCAL_MACHINE,
+            AttributeCount: 0,
+            Attributes: std::ptr::null_mut(),
+            TargetAlias: std::ptr::null_mut(),
+            UserName: std::ptr::null_mut(),
+        };
+        let result = unsafe { CredWriteW(&mut credential, 0) };
+        if result != TRUE {
+            let err = std::io::Error::last_os_error();
+            return Err(format!("failed to store token: {}", err).into());
+        }
+        Ok(())
+    }
+
+    fn erase(&self, index_url: &str) -> Result<(), Error> {
+        let target_name = target_name(index_url);
+        let result = unsafe { CredDeleteW(target_name.as_ptr(), CRED_TYPE_GENERIC, 0) };
+        if result != TRUE {
+            let err = std::io::Error::last_os_error();
+            if err.raw_os_error() == Some(ERROR_NOT_FOUND as i32) {
+                eprintln!("not currently logged in to `{}`", index_url);
+                return Ok(());
+            }
+            return Err(format!("failed to remove token: {}", err).into());
+        }
+        Ok(())
+    }
+}
+
+fn main() {
+    cargo_credential::main(WindowsCredential);
+}