From patchwork Fri Sep 29 23:10:05 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mahesh Bandewar X-Patchwork-Id: 820126 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=bandewar-net.20150623.gappssmtp.com header.i=@bandewar-net.20150623.gappssmtp.com header.b="r7QrJC0X"; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 3y3nNM6XVTz9t2r for ; Sat, 30 Sep 2017 09:10:43 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752618AbdI2XKM (ORCPT ); Fri, 29 Sep 2017 19:10:12 -0400 Received: from mail-pg0-f66.google.com ([74.125.83.66]:38639 "EHLO mail-pg0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752606AbdI2XKI (ORCPT ); Fri, 29 Sep 2017 19:10:08 -0400 Received: by mail-pg0-f66.google.com with SMTP id y192so628119pgd.5 for ; Fri, 29 Sep 2017 16:10:08 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bandewar-net.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id; bh=9UqblprLfsdHegfaYjxtJS3FN7jwOMkBYjhy3KSFmOo=; b=r7QrJC0XK3xxR/PlYRcjgtaq4yYWVfIOKxhf35UskJ5bAQYum/L54FbHTcfQaQXNrS LH59Hg+paZDmY7fbYFS5ZJl7huXsbhsyW8QXUddulXSZO5CN99JR7WHuqa7voWajS8Xs qd5FW2VXzKwXeZOzJcQO0+8n5U97lDoX8MIRYwnV3DZks2kG77mgfhfp0swrtdEgeWCH +lCAS5COkE8B/iPeomclmV1MAm2LVXypEv/2LVX4PrtQV83BAruNugQVR/zFLDs9VuAb nOsqbxWaUfx6Gzx/OvJwujoyruRHT+UCPDAb/w74T4YZPveFgfYwC2ezmmQEYItQNjiK /R3w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=9UqblprLfsdHegfaYjxtJS3FN7jwOMkBYjhy3KSFmOo=; b=uFPU5zHKMtH4HyRgotzf4hQciIiVdGGIXWC1ynfHbibLMkGo0NskKwR8WcT+/ObgW6 FMa1plqAwLE0bA2SJMCA8uqw0VL//Fty4etZt9eAZJjTVTMWSjtmQnenHi5iBs+leInF cEPOR1LnyBq+GZEa8NXAHnb3VlLBXAOuNzblBIdCxSUu3HqvZpd1qIWM/avttcfnyHSi xDAcz+3iwte81uu5Jfc3C2qA6cTcK9ZiSGBBfK64shEmiTbt3ysjn1hvT3iUNzYdYrDw umT/kLyT5W+VZRVwc7gqEbLYktUTNJmRvGKKCaRUx2wGyzKda3NJk5Jzlwuv2zp8OTgG qSpw== X-Gm-Message-State: AHPjjUjjzJiOuUkzUcKG89ujG64n9ezhflkRU6g7Ta42O94aI+w9Um3M K4rm1/8Gy+WO1Ie7lWJIRpXjpA== X-Google-Smtp-Source: AOwi7QBGrmFjPPRC/X9dkL0YP5vQ7m5LrljM7RKqxeUAw8lHolT9xax8rbXdFOqurjJa6rucR1ON3w== X-Received: by 10.98.207.194 with SMTP id b185mr9201362pfg.243.1506726608111; Fri, 29 Sep 2017 16:10:08 -0700 (PDT) Received: from localhost ([2620:15c:2cb:201:686e:64b1:c5a:1ad5]) by smtp.gmail.com with ESMTPSA id p12sm8163391pgd.0.2017.09.29.16.10.07 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Fri, 29 Sep 2017 16:10:07 -0700 (PDT) From: Mahesh Bandewar To: LKML Cc: Netdev , Kernel-hardening , Linux API , Kees Cook , Serge Hallyn , "Eric W . Biederman" , Eric Dumazet , David Miller , Mahesh Bandewar , Mahesh Bandewar Subject: [PATCH 1/2] capability: introduce sysctl for controlled user-ns capability whitelist Date: Fri, 29 Sep 2017 16:10:05 -0700 Message-Id: <20170929231005.29755-1-mahesh@bandewar.net> X-Mailer: git-send-email 2.14.2.822.g60be5d43e6-goog Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Mahesh Bandewar Add a sysctl variable kernel.controlled_userns_caps_whitelist. This takes input as capability mask expressed as two comma separated hex u32 words. The mask, however, is stored in kernel as kernel_cap_t type. Any capabilities that are not part of this mask will be controlled and will not be allowed to processes in controlled user-ns. Signed-off-by: Mahesh Bandewar --- Documentation/sysctl/kernel.txt | 21 ++++++++++++++++++ include/linux/capability.h | 3 +++ kernel/capability.c | 47 +++++++++++++++++++++++++++++++++++++++++ kernel/sysctl.c | 5 +++++ 4 files changed, 76 insertions(+) diff --git a/Documentation/sysctl/kernel.txt b/Documentation/sysctl/kernel.txt index 694968c7523c..a1d39dbae847 100644 --- a/Documentation/sysctl/kernel.txt +++ b/Documentation/sysctl/kernel.txt @@ -25,6 +25,7 @@ show up in /proc/sys/kernel: - bootloader_version [ X86 only ] - callhome [ S390 only ] - cap_last_cap +- controlled_userns_caps_whitelist - core_pattern - core_pipe_limit - core_uses_pid @@ -187,6 +188,26 @@ CAP_LAST_CAP from the kernel. ============================================================== +controlled_userns_caps_whitelist + +Capability mask that is whitelisted for "controlled" user namespaces. +Any capability that is missing from this mask will not be allowed to +any process that is attached to a controlled-userns. e.g. if CAP_NET_RAW +is not part of this mask, then processes running inside any controlled +userns's will not be allowed to perform action that needs CAP_NET_RAW +capability. However, processes that are attached to a parent user-ns +hierarchy that is *not* controlled and has CAP_NET_RAW can continue +performing those actions. User-namespaces are marked "controlled" at +the time of their creation based on the capabilities of the creator. +A process that does not have CAP_SYS_ADMIN will create user-namespaces +that are controlled. + +The value is expressed as two comma separated hex words (u32). This +sysctl is avaialble in init-ns and users with CAP_SYS_ADMIN in init-ns +are allowed to make changes. + +============================================================== + core_pattern: core_pattern is used to specify a core dumpfile pattern name. diff --git a/include/linux/capability.h b/include/linux/capability.h index b52e278e4744..6c0b9677c03f 100644 --- a/include/linux/capability.h +++ b/include/linux/capability.h @@ -13,6 +13,7 @@ #define _LINUX_CAPABILITY_H #include +#include #define _KERNEL_CAPABILITY_VERSION _LINUX_CAPABILITY_VERSION_3 @@ -247,6 +248,8 @@ extern bool ptracer_capable(struct task_struct *tsk, struct user_namespace *ns); /* audit system wants to get cap info from files as well */ extern int get_vfs_caps_from_disk(const struct dentry *dentry, struct cpu_vfs_cap_data *cpu_caps); +int proc_douserns_caps_whitelist(struct ctl_table *table, int write, + void __user *buff, size_t *lenp, loff_t *ppos); extern int cap_convert_nscap(struct dentry *dentry, void **ivalue, size_t size); diff --git a/kernel/capability.c b/kernel/capability.c index f97fe77ceb88..62dbe3350c1b 100644 --- a/kernel/capability.c +++ b/kernel/capability.c @@ -28,6 +28,8 @@ EXPORT_SYMBOL(__cap_empty_set); int file_caps_enabled = 1; +kernel_cap_t controlled_userns_caps_whitelist = CAP_FULL_SET; + static int __init file_caps_disable(char *str) { file_caps_enabled = 0; @@ -506,3 +508,48 @@ bool ptracer_capable(struct task_struct *tsk, struct user_namespace *ns) rcu_read_unlock(); return (ret == 0); } + +/* Controlled-userns capabilities routines */ +#ifdef CONFIG_SYSCTL +int proc_douserns_caps_whitelist(struct ctl_table *table, int write, + void __user *buff, size_t *lenp, loff_t *ppos) +{ + DECLARE_BITMAP(caps_bitmap, CAP_LAST_CAP); + struct ctl_table caps_table; + char tbuf[NAME_MAX]; + int ret; + + ret = bitmap_from_u32array(caps_bitmap, CAP_LAST_CAP, + controlled_userns_caps_whitelist.cap, + _KERNEL_CAPABILITY_U32S); + if (ret != CAP_LAST_CAP) + return -1; + + scnprintf(tbuf, NAME_MAX, "%*pb", CAP_LAST_CAP, caps_bitmap); + + caps_table.data = tbuf; + caps_table.maxlen = NAME_MAX; + caps_table.mode = table->mode; + ret = proc_dostring(&caps_table, write, buff, lenp, ppos); + if (ret) + return ret; + if (write) { + kernel_cap_t tmp; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + ret = bitmap_parse_user(buff, *lenp, caps_bitmap, CAP_LAST_CAP); + if (ret) + return ret; + + ret = bitmap_to_u32array(tmp.cap, _KERNEL_CAPABILITY_U32S, + caps_bitmap, CAP_LAST_CAP); + if (ret != CAP_LAST_CAP) + return -1; + + controlled_userns_caps_whitelist = tmp; + } + return 0; +} +#endif /* CONFIG_SYSCTL */ diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 6648fbbb8157..9903cf0de287 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -1229,6 +1229,11 @@ static struct ctl_table kern_table[] = { .extra2 = &one, }, #endif + { + .procname = "controlled_userns_caps_whitelist", + .mode = 0644, + .proc_handler = proc_douserns_caps_whitelist, + }, { } };