From nobody Tue Oct 17 19:43:32 2023 X-Original-To: dev-commits-src-branches@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 4S94Cn1Lycz4xvP4; Tue, 17 Oct 2023 19:43:33 +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 4S94Cn0nCjz3KtF; Tue, 17 Oct 2023 19:43:33 +0000 (UTC) (envelope-from git@FreeBSD.org) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=freebsd.org; s=dkim; t=1697571813; 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=K/0i3efXg5vKZirgDLphmskbzKId/zuGhs7aN19EGI8=; b=Ym8yBlvnytf0VoSSbi3oFpqsjZPZX0Gbwa85vfqgAgq3C7CFqNLZ2KwMidZPcREQRAIj7B moNuAUtg70UzVYUJuWtdeVxAspXOVD2Mx6lqoji9adYusn+uk9YGqulVrDEXwC4KUqrj9Q JiF73w7DMBz7vS2vH8o2nvACdbM2E/bDd2FDuT7XSSUE+4p/NL96y7YFbM3xhv84ntmrNM dQPdlGlhgd+WuawgMVA34lw27n1iB92Gns4OxMXffOkDQl/8srELfoX48+EoG2CX++vPty TSBGzvf0Fw97wTv3KRYwHRGKDfjQgIABPaxoTb8nmmgPC58QOzTLZ65MKrj6vQ== ARC-Seal: i=1; s=dkim; d=freebsd.org; t=1697571813; a=rsa-sha256; cv=none; b=FL6yo3SQNVNt9yVL6L30LkGAE8e6doVlmYoeErdQjAGaJiqXCR1Mhei5I6RUnkuzIHgJO2 LoPkst6QmcNk6YWAi4N3cUhmwhRdBYf+asiBT5FYTUVC1uf441RGXDx56MWsVUpw1QrQJ8 U1J4ZWr6YMZTmBKcooxYWffxIojkG+YByK4ZRmxAIZZHvbuSgzOxmEcXd5PiHdyD98LyV/ yZkTGxeHSsPuGAHstJq5+dk2vAT56kHNCDB0aC3fxcb1k/7Ggh4Ud65ABLjGShQ2oBM67K 1CN1OhywXXZaoSKKKNNmXjeVZeOpV6PTNcGRn5UGJ3FR1JpWe88+nAdoiZGVgg== 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=1697571813; 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=K/0i3efXg5vKZirgDLphmskbzKId/zuGhs7aN19EGI8=; b=Qv4hifu3c5Hd6p6kOq6ncjZ3tHEpAMypj/zSUpAQyAf3+wEv1EdavOfM8mtscM603+nq8t zrwARAIyYt0qaYO43W7+wMzAP+RXSp1JlLqL7o1/YiMaO4LA7I/m31C3+qak6DicVwOcTy X1Ge87SohQaYcMsTUJM/IE+prnVXuIR7HIUA5jTDUC1LvCdNy+cSRQEueMUrpjzUbm2H0T atGpA+TVT4A2gBoGo+OrjapEU1fR0DrALe4c/keLk08YQDs7CwtSJUg5tOdlFWQbX3Ok54 U/y6IOWoFi5q0iuCNkEXqiIdX+qOR+63pkHu/0dDBy3gwmXCU5u6Wfoz+E4VIQ== 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 4S94Cm6nW9zd0B; Tue, 17 Oct 2023 19:43:32 +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 39HJhWtX013173; Tue, 17 Oct 2023 19:43:32 GMT (envelope-from git@gitrepo.freebsd.org) Received: (from git@localhost) by gitrepo.freebsd.org (8.17.1/8.17.1/Submit) id 39HJhW2k013170; Tue, 17 Oct 2023 19:43:32 GMT (envelope-from git) Date: Tue, 17 Oct 2023 19:43:32 GMT Message-Id: <202310171943.39HJhW2k013170@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: e04b81f8b76c - stable/14 - cr_canseeotheruids(9): Revamp, mark as internal List-Id: Commits to the stable branches of the FreeBSD src repository List-Archive: https://lists.freebsd.org/archives/dev-commits-src-branches List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-dev-commits-src-branches@freebsd.org X-BeenThere: dev-commits-src-branches@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: e04b81f8b76ceb31abec1c739b42e70433047d3d Auto-Submitted: auto-generated The branch stable/14 has been updated by mhorne: URL: https://cgit.FreeBSD.org/src/commit/?id=e04b81f8b76ceb31abec1c739b42e70433047d3d commit e04b81f8b76ceb31abec1c739b42e70433047d3d Author: Olivier Certner AuthorDate: 2023-08-17 23:54:42 +0000 Commit: Mitchell Horne CommitDate: 2023-10-17 19:42:58 +0000 cr_canseeotheruids(9): Revamp, mark as internal Significantly clarify. Replace references to cr_canseeothergids(9) by ones to cr_bsd_visible(9). Reviewed by: bcr, mhorne MFC after: 2 weeks Sponsored by: Kumacom SAS Differential Revision: https://reviews.freebsd.org/D40635 (cherry picked from commit 4ddd253b38dff8725555355cc1b5238b1bbfd380) --- share/man/man9/cr_canseeotheruids.9 | 73 ++++++++++++++++++------------------- 1 file changed, 36 insertions(+), 37 deletions(-) diff --git a/share/man/man9/cr_canseeotheruids.9 b/share/man/man9/cr_canseeotheruids.9 index 80acc2d7a6ca..230c5ea59b78 100644 --- a/share/man/man9/cr_canseeotheruids.9 +++ b/share/man/man9/cr_canseeotheruids.9 @@ -1,5 +1,6 @@ .\" .\" Copyright (c) 2003 Joseph Koshy +.\" Copyright (c) 2023 Olivier Certner .\" .\" All rights reserved. .\" @@ -25,56 +26,54 @@ .\" (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 November 11, 2003 +.Dd August 18, 2023 .Dt CR_CANSEEOTHERUIDS 9 .Os .Sh NAME .Nm cr_canseeotheruids -.Nd determine visibility of objects given their user credentials +.Nd determine if subjects may see entities with differing user ID .Sh SYNOPSIS .Ft int .Fn cr_canseeotheruids "struct ucred *u1" "struct ucred *u2" .Sh DESCRIPTION -This function determines the visibility of objects in the -kernel based on the real user IDs in the credentials +.Bf -emphasis +This function is internal. +Its functionality is integrated into the function +.Xr cr_bsd_visible 9 , +which should be called instead. +.Ef +.Pp +This function checks if a subject associated to credentials .Fa u1 -and +is denied seeing a subject or object associated to credentials .Fa u2 -associated with them. +by a policy that requires both credentials to have the same real user ID. .Pp -The visibility of objects is influenced by the +This policy is active if and only if the .Xr sysctl 8 variable -.Va security.bsd.see_other_uids . -If this variable is non-zero then all objects in the kernel -are visible to each other irrespective of their user IDs. -If this variable is zero then the object with credentials -.Fa u2 -is visible to the object with credentials -.Fa u1 -if either -.Fa u1 -is the super-user credential, or if -.Fa u1 -and -.Fa u2 -have the same real user ID. -.Sh SYSCTL VARIABLES -.Bl -tag -width indent -.It Va security.bsd.see_other_uids -Must be non-zero if objects with unprivileged credentials are to be -able to see each other. -.El +.Va security.bsd.see_other_uids +is set to zero. +.Pp +As usual, the superuser (effective user ID 0) is exempt from this policy +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 . .Sh RETURN VALUES -This function returns zero if the object with credential +The +.Fn cr_canseeotheruids +function returns 0 if the policy is disabled, both credentials have the same +real user ID, or if .Fa u1 -can -.Dq see -the object with credential -.Fa u2 , -or -.Er ESRCH -otherwise. +has privilege exempting it from the policy. +Otherwise, it returns +.Er ESRCH . .Sh SEE ALSO -.Xr cr_canseeothergids 9 , -.Xr p_candebug 9 +.Xr cr_bsd_visible 9 , +.Xr priv_check_cred 9