From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from firstgate.proxmox.com (firstgate.proxmox.com [212.224.123.68]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by lists.proxmox.com (Postfix) with ESMTPS id C7EEB93406 for ; Mon, 19 Feb 2024 18:14:54 +0100 (CET) Received: from firstgate.proxmox.com (localhost [127.0.0.1]) by firstgate.proxmox.com (Proxmox) with ESMTP id A668133788 for ; Mon, 19 Feb 2024 18:14:24 +0100 (CET) Received: from proxmox-new.maurer-it.com (proxmox-new.maurer-it.com [94.136.29.106]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by firstgate.proxmox.com (Proxmox) with ESMTPS for ; Mon, 19 Feb 2024 18:14:23 +0100 (CET) Received: from proxmox-new.maurer-it.com (localhost.localdomain [127.0.0.1]) by proxmox-new.maurer-it.com (Proxmox) with ESMTP id C39DD43A96 for ; Mon, 19 Feb 2024 18:14:22 +0100 (CET) From: Thomas Lamprecht To: pve-devel@lists.proxmox.com Date: Mon, 19 Feb 2024 18:14:10 +0100 Message-Id: <20240219171412.1576651-3-t.lamprecht@proxmox.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240219171412.1576651-1-t.lamprecht@proxmox.com> References: <20240219171412.1576651-1-t.lamprecht@proxmox.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SPAM-LEVEL: Spam detection results: 0 AWL -0.057 Adjusted score from AWL reputation of From: address BAYES_00 -1.9 Bayes spam probability is 0 to 1% DMARC_MISSING 0.1 Missing DMARC policy KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record SPF_PASS -0.001 SPF: sender matches SPF record T_SCC_BODY_TEXT_LINE -0.01 - Subject: [pve-devel] [PATCH storage:] fix #5254: api: allow usage of download-url with Sys.AccessNetwork X-BeenThere: pve-devel@lists.proxmox.com X-Mailman-Version: 2.1.29 Precedence: list List-Id: Proxmox VE development discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 19 Feb 2024 17:14:54 -0000 The download-url API endpoint has some implications that admins are unaware of, namely that it basically allow to scan the whole network via HTTP URLs, and potentially even download some image that the user should not have access to and adding to a VM that the user controls. That's why in addition to the Datastore.AllocateTemplate privilege on the storage, the Sys.Modify on the whole Cluster was required to use the API call. That design was chosen as we were not fully sure if a separate privilege is warranted, but user feedback has shown that the (not so big) cost of adding such a new privilege is justified. Change the permission check to allow the combination of Datastore.AllocateTemplate on the storage and either 'Sys.Modify' on /, for backwards compatibility, or the newer 'Sys.AccessNetwork' on the node that handles the download. Using a node-specific ACL path allows admins to e.g. prepare one specific node's firewall so that pveproxy can access only a safe set of hosts via outgoing HTTP (not stemming from valid connection tracking to the PVE API), and thus even further limit the privileges of users or tools that are trusted to download images to a storage. Buglink: https://bugzilla.proxmox.com/show_bug.cgi?id=5254 Signed-off-by: Thomas Lamprecht --- src/PVE/API2/Storage/Status.pm | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/src/PVE/API2/Storage/Status.pm b/src/PVE/API2/Storage/Status.pm index b2336e6..bc67b81 100644 --- a/src/PVE/API2/Storage/Status.pm +++ b/src/PVE/API2/Storage/Status.pm @@ -546,9 +546,15 @@ __PACKAGE__->register_method({ description => "Download templates and ISO images by using an URL.", proxyto => 'node', permissions => { + description => 'Requires allocation access on the storage and as this allows one to probe' + .' the (local!) host network indirectly it also requires one of Sys.Modify on / (for' + .' backwards compatibility) or the newer Sys.AccessNetwork privilege on the node.', check => [ 'and', ['perm', '/storage/{storage}', [ 'Datastore.AllocateTemplate' ]], - ['perm', '/', [ 'Sys.Audit', 'Sys.Modify' ]], + [ 'or', + ['perm', '/', [ 'Sys.Audit', 'Sys.Modify' ]], + ['perm', '/nodes/{node}', [ 'Sys.AccessNetwork' ]], + ], ], }, protected => 1, -- 2.39.2