[pbs-devel] [PATCH proxmox-backup 2/2] fix #3853: tape cli: add force flag to key change-passphrase

[Stefan Sterz <s.sterz@proxmox.com>]

Adds the '--force' flag to the proxmox-tape command allowing users
with root privileges to overwrite the passphrase of a given key.

Signed-off-by: Stefan Sterz <s.sterz@proxmox.com>
---
 src/bin/proxmox_tape/encryption_key.rs | 23 +++++++++++++++++++++--
 1 file changed, 21 insertions(+), 2 deletions(-)

diff --git a/src/bin/proxmox_tape/encryption_key.rs b/src/bin/proxmox_tape/encryption_key.rs
index 156295fd..3dd9b58b 100644
--- a/src/bin/proxmox_tape/encryption_key.rs
+++ b/src/bin/proxmox_tape/encryption_key.rs
@@ -146,11 +146,18 @@ fn show_key(
             hint: {
                 schema: PASSWORD_HINT_SCHEMA,
             },
+            force: {
+                optional: true,
+                type: bool,
+                description: "Don't ask for the old passphrase and overwrite it. Root only.",
+                default: false,
+            },
         },
     },
 )]
 /// Change the encryption key's password.
 fn change_passphrase(
+    force: bool,
     mut param: Value,
     rpcenv: &mut dyn RpcEnvironment,
 ) -> Result<(), Error> {
@@ -159,11 +166,23 @@ fn change_passphrase(
         bail!("unable to change passphrase - no tty");
     }
 
-    let password = tty::read_password("Current Tape Encryption Key Password: ")?;
+    let effective_uid = nix::unistd::Uid::effective();
+    let running_uid = nix::unistd::Uid::current();
+
+    // if the `--force` flag is provided check if we are root
+    if force && !effective_uid.is_root() && !running_uid.is_root() {
+        bail!("the force flag requires root privileges");
+    }
+
+    if force {
+        param["force"] = serde_json::Value::Bool(true);
+    } else {
+        let password = tty::read_password("Current Tape Encryption Key Password: ")?;
+        param["password"] = String::from_utf8(password)?.into();
+    }
 
     let new_password = tty::read_and_verify_password("New Tape Encryption Key Password: ")?;
 
-    param["password"] = String::from_utf8(password)?.into();
     param["new-password"] = String::from_utf8(new_password)?.into();
 
     let info = &api2::config::tape_encryption_keys::API_METHOD_CHANGE_PASSPHRASE;
-- 
2.30.2