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* [pbs-devel] [PATCH proxmox-backup] api: metrics: check permissions before reading any data from the cache
@ 2024-10-15 13:50 Lukas Wagner
  2024-10-15 14:04 ` [pbs-devel] applied: " Wolfgang Bumiller
  2024-10-16  7:26 ` [pbs-devel] " Thomas Lamprecht
  0 siblings, 2 replies; 3+ messages in thread
From: Lukas Wagner @ 2024-10-15 13:50 UTC (permalink / raw)
  To: pbs-devel

Reading from the metric cache is somewhat expensive, so validate as many
of the required permissions as possible. For host metrics, we can
do the full check in advance. For datastores, we check if we have
audit permissions for *any* datastore. If we do not have privs for
either of those, we return early and avoid reading from the
cache altogether.

Signed-off-by: Lukas Wagner <l.wagner@proxmox.com>
Suggested-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
---
 src/api2/status/metrics.rs | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/src/api2/status/metrics.rs b/src/api2/status/metrics.rs
index b8aaceeb..a0004ef9 100644
--- a/src/api2/status/metrics.rs
+++ b/src/api2/status/metrics.rs
@@ -37,6 +37,25 @@ pub fn get_metrics(
     let auth_id: Authid = rpcenv.get_auth_id().unwrap().parse()?;
     let user_info = CachedUserInfo::new()?;
 
+    let has_any_datastore_audit_privs =
+        user_info.any_privs_below(&auth_id, &["datastore"], PRIV_DATASTORE_AUDIT)?;
+
+    let has_host_audit_privs =
+        (CachedUserInfo::lookup_privs(&user_info, &auth_id, &["system", "status"])
+            & PRIV_SYS_AUDIT)
+            != 0;
+
+    if !has_any_datastore_audit_privs && !has_host_audit_privs {
+        // The `pull_metrics::get_*` calls are expensive, so
+        // check early if the current user has sufficient privileges to read *any*
+        // metric data.
+        // For datastores, we do not yet know for which individual datastores
+        // we have metrics in the cache, so we just check if we have
+        // audit permissions for *any* datastore and filter after
+        // reading the data.
+        return Ok(Metrics { data: Vec::new() });
+    }
+
     let metrics = if history {
         pull_metrics::get_all_metrics(start_time)?
     } else {
@@ -46,11 +65,10 @@ pub fn get_metrics(
     let filter_by_privs = |point: &MetricDataPoint| {
         let id = point.id.as_str();
         if id == "host" {
-            let user_privs =
-                CachedUserInfo::lookup_privs(&user_info, &auth_id, &["system", "status"]);
-            return (user_privs & PRIV_SYS_AUDIT) != 0;
+            return has_host_audit_privs;
         } else if let Some(datastore_id) = id.strip_prefix("datastore/") {
             if !datastore_id.contains('/') {
+                // Now, check whether we have permissions for the individual datastore
                 let user_privs = CachedUserInfo::lookup_privs(
                     &user_info,
                     &auth_id,
-- 
2.39.5



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^ permalink raw reply	[flat|nested] 3+ messages in thread

* [pbs-devel] applied: [PATCH proxmox-backup] api: metrics: check permissions before reading any data from the cache
  2024-10-15 13:50 [pbs-devel] [PATCH proxmox-backup] api: metrics: check permissions before reading any data from the cache Lukas Wagner
@ 2024-10-15 14:04 ` Wolfgang Bumiller
  2024-10-16  7:26 ` [pbs-devel] " Thomas Lamprecht
  1 sibling, 0 replies; 3+ messages in thread
From: Wolfgang Bumiller @ 2024-10-15 14:04 UTC (permalink / raw)
  To: Lukas Wagner; +Cc: pbs-devel

applied, thanks


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^ permalink raw reply	[flat|nested] 3+ messages in thread

* Re: [pbs-devel] [PATCH proxmox-backup] api: metrics: check permissions before reading any data from the cache
  2024-10-15 13:50 [pbs-devel] [PATCH proxmox-backup] api: metrics: check permissions before reading any data from the cache Lukas Wagner
  2024-10-15 14:04 ` [pbs-devel] applied: " Wolfgang Bumiller
@ 2024-10-16  7:26 ` Thomas Lamprecht
  1 sibling, 0 replies; 3+ messages in thread
From: Thomas Lamprecht @ 2024-10-16  7:26 UTC (permalink / raw)
  To: Proxmox Backup Server development discussion, Lukas Wagner

Am 15/10/2024 um 15:50 schrieb Lukas Wagner:
> Reading from the metric cache is somewhat expensive, so validate as many
> of the required permissions as possible. For host metrics, we can
> do the full check in advance. For datastores, we check if we have
> audit permissions for *any* datastore. If we do not have privs for
> either of those, we return early and avoid reading from the
> cache altogether.
> 
> Signed-off-by: Lukas Wagner <l.wagner@proxmox.com>
> Suggested-by: Wolfgang Bumiller <w.bumiller@proxmox.com>

tiny nit: these should be normally switched, to keep the causal order intact.
I.e., the suggestion normally happens before you make the change that you
sign-off, that's also why r-b/t-b trailers should get added below ones s-o-b.


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^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2024-10-16  7:26 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2024-10-15 13:50 [pbs-devel] [PATCH proxmox-backup] api: metrics: check permissions before reading any data from the cache Lukas Wagner
2024-10-15 14:04 ` [pbs-devel] applied: " Wolfgang Bumiller
2024-10-16  7:26 ` [pbs-devel] " Thomas Lamprecht

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