move token_shadow to pbs_config workspace

Also moved out crypt.rs (libcrypt bindings) to pbs_tools workspace.

pbs-config/src/lib.rs

@@ -7,6 +7,7 @@ pub mod remote;
 pub mod sync;
 pub mod tape_encryption_keys;
 pub mod tape_job;
+pub mod token_shadow;
 pub mod verify;
 
 use anyhow::{format_err, Error};

pbs-config/src/token_shadow.rs

@@ -0,0 +1,96 @@
+use std::collections::HashMap;
+
+use anyhow::{bail, format_err, Error};
+use serde::{Serialize, Deserialize};
+use serde_json::{from_value, Value};
+
+use proxmox::tools::fs::CreateOptions;
+
+use pbs_api_types::Authid;
+//use crate::auth;
+use crate::{open_backup_lockfile, BackupLockGuard};
+
+const LOCK_FILE: &str = pbs_buildcfg::configdir!("/token.shadow.lock");
+const CONF_FILE: &str = pbs_buildcfg::configdir!("/token.shadow");
+
+#[derive(Serialize, Deserialize)]
+#[serde(rename_all="kebab-case")]
+/// ApiToken id / secret pair
+pub struct ApiTokenSecret {
+    pub tokenid: Authid,
+    pub secret: String,
+}
+
+// Get exclusive lock
+fn lock_config() -> Result<BackupLockGuard, Error> {
+    open_backup_lockfile(LOCK_FILE, None, true)
+}
+
+fn read_file() -> Result<HashMap<Authid, String>, Error> {
+    let json = proxmox::tools::fs::file_get_json(CONF_FILE, Some(Value::Null))?;
+
+    if json == Value::Null {
+        Ok(HashMap::new())
+    } else {
+        // swallow serde error which might contain sensitive data
+        from_value(json).map_err(|_err| format_err!("unable to parse '{}'", CONF_FILE))
+    }
+}
+
+fn write_file(data: HashMap<Authid, String>) -> Result<(), Error> {
+    let backup_user = crate::backup_user()?;
+    let options = CreateOptions::new()
+        .perm(nix::sys::stat::Mode::from_bits_truncate(0o0640))
+        .owner(backup_user.uid)
+        .group(backup_user.gid);
+
+    let json = serde_json::to_vec(&data)?;
+    proxmox::tools::fs::replace_file(CONF_FILE, &json, options)
+}
+
+
+/// Verifies that an entry for given tokenid / API token secret exists
+pub fn verify_secret(tokenid: &Authid, secret: &str) -> Result<(), Error> {
+    if !tokenid.is_token() {
+        bail!("not an API token ID");
+    }
+
+    let data = read_file()?;
+    match data.get(tokenid) {
+        Some(hashed_secret) => {
+            pbs_tools::crypt::verify_crypt_pw(secret, &hashed_secret)
+        },
+        None => bail!("invalid API token"),
+    }
+}
+
+/// Adds a new entry for the given tokenid / API token secret. The secret is stored as salted hash.
+pub fn set_secret(tokenid: &Authid, secret: &str) -> Result<(), Error> {
+    if !tokenid.is_token() {
+        bail!("not an API token ID");
+    }
+
+    let _guard = lock_config()?;
+
+    let mut data = read_file()?;
+    let hashed_secret = pbs_tools::crypt::encrypt_pw(secret)?;
+    data.insert(tokenid.clone(), hashed_secret);
+    write_file(data)?;
+
+    Ok(())
+}
+
+/// Deletes the entry for the given tokenid.
+pub fn delete_secret(tokenid: &Authid) -> Result<(), Error> {
+    if !tokenid.is_token() {
+        bail!("not an API token ID");
+    }
+
+    let _guard = lock_config()?;
+
+    let mut data = read_file()?;
+    data.remove(tokenid);
+    write_file(data)?;
+
+    Ok(())
+}