[pbs-devel] [PATCH v2 proxmox-backup 1/2] access: limit editing pam credentials to superuser

[Oguz Bektas <o.bektas@proxmox.com>]

modifying @pam users credentials should be only possible for root@pam,
otherwise it can have unintended consequences.

Signed-off-by: Oguz Bektas <o.bektas@proxmox.com>
---
v1->v2:
* change error message to be more descriptive
* remove empty line
* create CachedUserInfo in the if-branch


 src/api2/access/user.rs | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/api2/access/user.rs b/src/api2/access/user.rs
index 484919bf..4c861c5f 100644
--- a/src/api2/access/user.rs
+++ b/src/api2/access/user.rs
@@ -350,6 +350,7 @@ pub fn update_user(
     email: Option<String>,
     delete: Option<Vec<DeletableProperty>>,
     digest: Option<String>,
+    rpcenv: &mut dyn RpcEnvironment,
 ) -> Result<(), Error> {
 
     let _lock = open_file_locked(user::USER_CFG_LOCKFILE, std::time::Duration::new(10, 0), true)?;
@@ -392,7 +393,12 @@ pub fn update_user(
     }
 
     if let Some(password) = password {
+        let user_info = CachedUserInfo::new()?;
+        let source_auth_id = rpcenv.get_auth_id().unwrap().parse()?;
         let authenticator = crate::auth::lookup_authenticator(userid.realm())?;
+        if userid.realm() == "pam" && !user_info.is_superuser(&source_auth_id) {
+            bail!("only superuser can edit pam credentials!");
+        }
         authenticator.store_password(userid.name(), &password)?;
     }
 
-- 
2.20.1