From nobody Tue Oct 17 19:43:29 2023 X-Original-To: dev-commits-src-all@mlmmj.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mlmmj.nyi.freebsd.org (Postfix) with ESMTP id 4S94Cj67yGz4xvnH; Tue, 17 Oct 2023 19:43:29 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from mxrelay.nyi.freebsd.org (mxrelay.nyi.freebsd.org [IPv6:2610:1c1:1:606c::19:3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (4096 bits) client-digest SHA256) (Client CN "mxrelay.nyi.freebsd.org", Issuer "R3" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4S94Cj5FRKz3Kgy; Tue, 17 Oct 2023 19:43:29 +0000 (UTC) (envelope-from git@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1697571809; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=T5aUray6WaQIosna2Lb2K/O+xz2ciflPGQQcl93VXoE=; b=IuyzHjrKmnBzH0mm57MBi8Neekv8IemOnjBpwkS4Sips3RUJWsZs9omzHDF5fhNAuUD59e b2swTJfG9q7y0oA0poGPjA+1b4/j+NaCCne+NNVReK5DO3hRI5tqOEffq+deNOM2dq+q3B OPDOhCQOmGKqnEKrV9WCk9sg6vsEqB8s2YfRwwpYef2APObd1JfxauvMIrEiOqQ7WseCrR lDIhgtPmq86r9fjUjbcRRhoDB0tF4k6z5Umikj8OylUIaHLzOpns7lN+1TU+i7Vc767WT0 yI50P0F8dR07bfH4ZoRMeNYTD3iDHNwKnLz9AX22CGarL9xMo/0Hdy0DdWDm8g== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1697571809; a=rsa-sha256; cv=none; b=gE1O69dk7H8bXWQy+IZv+kwCD6mgOibNDV/oir8WKl+pqI+9eBY+M7NpGDFF3Lev00tqMs pDDrQ9UYj6Z4El0hBXs9zGVrKIobfQSDcmmrFuxa0eZvaZJmGv92QNQhgK3y/OlMdmU2Tl 4YMIOVGw/XFHTSQsVVhzUs1+36ceGT5zirkk4l/8b+KY9bR4DbhnSB0bOWotq4GiGU8pS2 Yu9lHnuPPDW7riCrPz/9U73S1ZyWJvBrln+qDc34rJMmqsRvSEIQfff+PXRGG8AKEC6zaa jg0Y9sC/ZZyc/EhDynbCNFeDadgRAEcFEP29Wyi/gA6ZL1wPhxlPXCexiEa5tQ== ARC-Authentication-Results: i=1; mx1.freebsd.org; none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1697571809; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=T5aUray6WaQIosna2Lb2K/O+xz2ciflPGQQcl93VXoE=; b=OINrwmGG6VORZxhVeoxULGay2Ktn+TlAlUcNZlKNJcCU+OUZItLN0CiAcytozqqftkKvyi 7FyZciXRm0ybPtpmy8Kq4If/G3CegbEX98Abj7Q1/MGgrcLDH1c4XqUk1X0rnp5cPOQdFN EgKDtzl56AMjDzdjmg91/0QPjRW5npNbfUwdJR+Dw/+eZooADZkYE9BLCLUH67Q2uZS4yw 6f7/7hQqmnX3XZyDD7RZWIworMLS3Ok3JcWLqyaOnkEFQkinR2qv6OE52f0j7Xz7DPoKEF kpgYxM5lagBtbW6usc9oFkeln1iJbxJBf7CnBM4d9MX48/kdg+YCylo3aR1FVw== Received: from gitrepo.freebsd.org (gitrepo.freebsd.org [IPv6:2610:1c1:1:6068::e6a:5]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mxrelay.nyi.freebsd.org (Postfix) with ESMTPS id 4S94Cj4LKHzcr7; Tue, 17 Oct 2023 19:43:29 +0000 (UTC) (envelope-from git@FreeBSD.org) Received: from gitrepo.freebsd.org ([127.0.1.44]) by gitrepo.freebsd.org (8.17.1/8.17.1) with ESMTP id 39HJhTXk013037; Tue, 17 Oct 2023 19:43:29 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.17.1/8.17.1/Submit) id 39HJhTkt013033; Tue, 17 Oct 2023 19:43:29 GMT (envelope-from git) Date: Tue, 17 Oct 2023 19:43:29 GMT Message-Id: <202310171943.39HJhTkt013033@gitrepo.freebsd.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org From: Mitchell Horne Subject: git: d9181d86c6ae - stable/14 - cr_bsd_visible(9): New man page List-Id: Commit messages for all branches of the src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-all List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-dev-commits-src-all@freebsd.org X-BeenThere: dev-commits-src-all@freebsd.org MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Git-Committer: mhorne X-Git-Repository: src X-Git-Refname: refs/heads/stable/14 X-Git-Reftype: branch X-Git-Commit: d9181d86c6aed243927620b414a7c37b1ae613d7 Auto-Submitted: auto-generated The branch stable/14 has been updated by mhorne: URL: https://cgit.FreeBSD.org/src/commit/?id=d9181d86c6aed243927620b414a7c37b1ae613d7 commit d9181d86c6aed243927620b414a7c37b1ae613d7 Author: Olivier Certner AuthorDate: 2023-08-17 23:54:40 +0000 Commit: Mitchell Horne CommitDate: 2023-10-17 19:42:58 +0000 cr_bsd_visible(9): New man page Reviewed by: bcr, pauamma_gundo.com MFC after: 2 weeks Sponsored by: Kumacom SAS Differential Revision: https://reviews.freebsd.org/D40632 (cherry picked from commit 0d6bf73c4f20e6ed719c29c1b382d24bb0a81a2f) --- share/man/man9/Makefile | 1 + share/man/man9/cr_bsd_visible.9 | 117 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 118 insertions(+) diff --git a/share/man/man9/Makefile b/share/man/man9/Makefile index 71a11a7cc6c0..c3c81719b7d2 100644 --- a/share/man/man9/Makefile +++ b/share/man/man9/Makefile @@ -68,6 +68,7 @@ MAN= accept_filter.9 \ copy.9 \ counter.9 \ cpuset.9 \ + cr_bsd_visible.9 \ cr_cansee.9 \ cr_canseejailproc.9 \ cr_canseeothergids.9 \ diff --git a/share/man/man9/cr_bsd_visible.9 b/share/man/man9/cr_bsd_visible.9 new file mode 100644 index 000000000000..bd676e6f5705 --- /dev/null +++ b/share/man/man9/cr_bsd_visible.9 @@ -0,0 +1,117 @@ +.\" +.\" SPDX-License-Identifier: BSD-2-Clause +.\" +.\" Copyright (c) 2023 Olivier Certner +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``AS IS'' AND ANY EXPRESS OR +.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES +.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. +.\" IN NO EVENT SHALL THE DEVELOPERS BE LIABLE FOR ANY DIRECT, INDIRECT, +.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT +.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, +.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY +.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF +.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +.\" +.Dd August 18, 2023 +.Dt CR_BSD_VISIBLE 9 +.Os +.Sh NAME +.Nm cr_bsd_visible +.Nd determine if subjects may see entities according to BSD security policies +.Sh SYNOPSIS +.In sys/proc.h +.Ft int +.Fn cr_bsd_visible "struct ucred *u1" "struct ucred *u2" +.Sh DESCRIPTION +This function determines if a subject with credentials +.Fa u1 +is denied seeing an object or subject associated to credentials +.Fa u2 +by the following policies and associated +.Xr sysctl 8 +knobs: +.Bl -tag -width indent +.It Va security.bsd.seeotheruids +If set to 0, subjects cannot see other subjects or objects if they are not +associated with the same real user ID. +The corresponding internal function is +.Xr cr_canseeotheruids 9 . +.It Va security.bsd.seeothergids +If set to 0, subjects cannot see other subjects or objects if they are not both +a member of at least one common group. +The corresponding internal function is +.Xr cr_canseeothergids 9 . +.It Va security.bsd.see_jail_proc +If set to 0, subjects cannot see other subjects or objects that are not +associated with the same jail as they are. +The corresponding internal function is +.Xr cr_canseejailproc 9 . +.El +.Pp +As usual, the superuser (effective user ID 0) is exempt from any of these +policies provided that the +.Xr sysctl 8 +variable +.Va security.bsd.suser_enabled +is non-zero and no active MAC policy explicitly denies the exemption +.Po +see +.Xr priv_check_cred 9 +.Pc . +.Pp +This function is intended to be used as a helper to implement +.Xr cr_cansee 9 +and similar functions. +.Sh RETURN VALUES +This function returns zero if a subject with credentials +.Fa u1 +may see a subject or object with credentials +.Fa u2 +by the active above-mentioned policies, or +.Er ESRCH +otherwise. +.Sh ERRORS +.Bl -tag -width Er +.It Bq Er ESRCH +Credentials +.Fa u1 +and +.Fa u2 +do not have the same real user ID. +.It Bq Er ESRCH +Credentials +.Fa u1 +and +.Fa u2 +are not members of any common group +.Po +as determined by +.Xr groupmember 9 +.Pc . +.It Bq Er ESRCH +Credentials +.Fa u1 +and +.Fa u2 +are not in the same jail. +.El +.Sh SEE ALSO +.Xr cr_canseeotheruids 9 , +.Xr cr_canseeothergids 9 , +.Xr cr_canseejailproc 9 , +.Xr priv_check_cred 9 , +.Xr cr_cansee 9 +.Sh AUTHORS +This function and its manual page were written by +.An Olivier Certner Aq Mt olce.freebsd@certner.fr .