Changes in files.secmodel

Changes in files.secmodel http://nxr.netbsd.org/rss/src/sys/secmodel/files.secmodel en Copyright 2005 Java Implement the register/deregister/evaluation API for secmodel(9). It allows registration of callbacks that can be used later for cross-secmodel "safe" communication. When a secmodel wishes to know a property maintained by another secmodel, it has to submit a request to it so the other secmodel can proceed to evaluating the request. This is done through the secmodel_eval(9) call; example: bool isroot; error = secmodel_eval("org.netbsd.secmodel.suser", "is-root", cred, &isroot); if (error == 0 && !isroot) result = KAUTH_RESULT_DENY; This one asks the suser module if the credentials are assumed to be root when evaluated by suser module. If the module is present, it will respond. If absent, the call will return an error. Args and command are arbitrarily defined; it's up to the secmodel(9) to document what it expects. Typical example is securelevel testing: when someone wants to know whether securelevel is raised above a certain level or not, the caller has to request this property to the secmodel_securelevel(9) module. Given that securelevel module may be absent from system's context (thus making access to the global "securelevel" variable impossible or unsafe), this API can cope with this absence and return an error. We are using secmodel_eval(9) to implement a secmodel_extensions(9) module, which plugs with the bsd44, suser and securelevel secmodels to provide the logic behind curtain, usermount and user_set_cpu_affinity modes, without adding hooks to traditional secmodels. This solves a real issue with the current secmodel(9) code, as usermount or user_set_cpu_affinity are not really tied to secmodel_suser(9). The secmodel_eval(9) is also used to restrict security.models settings when securelevel is above 0, through the "is-securelevel-above" evaluation: - curtain can be enabled any time, but cannot be disabled if securelevel is above 0. - usermount/user_set_cpu_affinity can be disabled any time, but cannot be enabled if securelevel is above 0. Regarding sysctl(7) entries: curtain and usermount are now found under security.models.extensions tree. The security.curtain and vfs.generic.usermount are still accessible for backwards compat. Documentation is incoming, I am proof-reading my writings. Written by elad@, reviewed and tested (anita test + interact for rights tests) by me. ok elad@. See also http://mail-index.netbsd.org/tech-security/2011/11/29/msg000422.html XXX might consider va0 mapping too. XXX Having a secmodel(9) specific printf (like aprint_*) for reporting secmodel(9) errors might be a good idea, but I am not sure on how to design such a function right now. /src/sys/secmodel/files.secmodel - 1.5 Sun Dec 04 19:24:59 UTC 2011 jym branches: 1.4.12; 1.4.16; First part of secmodel cleanup and other misc. changes: - Separate the suser part of the bsd44 secmodel into its own secmodel and directory, pending even more cleanups. For revision history purposes, the original location of the files was src/sys/secmodel/bsd44/secmodel_bsd44_suser.c src/sys/secmodel/bsd44/suser.h - Add a man-page for secmodel_suser(9) and update the one for secmodel_bsd44(9). - Add a "secmodel" module class and use it. Userland program and documentation updated. - Manage secmodel count (nsecmodels) through the module framework. This eliminates the need for secmodel_{,de}register() calls in secmodel code. - Prepare for secmodel modularization by adding relevant module bits. The secmodels don't allow auto unload. The bsd44 secmodel depends on the suser and securelevel secmodels. The overlay secmodel depends on the bsd44 secmodel. As the module class is only cosmetic, and to prevent ambiguity, the bsd44 and overlay secmodels are prefixed with "secmodel_". - Adapt the overlay secmodel to recent changes (mainly vnode scope). - Stop using link-sets for the sysctl node(s) creation. - Keep sysctl variables under nodes of their relevant secmodels. In other words, don't create duplicates for the suser/securelevel secmodels under the bsd44 secmodel, as the latter is merely used for "grouping". - For the suser and securelevel secmodels, "advertise presence" in relevant sysctl nodes (sysctl.security.models.{suser,securelevel}). - Get rid of the LKM preprocessor stuff. - As secmodels are now modules, there's no need for an explicit call to secmodel_start(); it's handled by the module framework. That said, the module framework was adjusted to properly load secmodels early during system startup. - Adapt rump to changes: Instead of using empty stubs for securelevel, simply use the suser secmodel. Also replace secmodel_start() with a call to secmodel_suser_start(). - 5.99.20. Testing was done on i386 ("release" build). Spearated module_init() changes were tested on sparc and sparc64 as well by martin@ (thanks!). Mailing list reference: http://mail-index.netbsd.org/tech-kern/2009/09/25/msg006135.html /src/sys/secmodel/files.secmodel - 1.4 Fri Oct 02 18:50:13 UTC 2009 elad Add support for multi-position electro-mechanical keylocks. An example driver, gpiolock(4), is provided as an example how to interface real hardware. A new securemodel, securemodel_keylock, is provided to show how this can be used to tie keylocks to overall system security. This is experimental code. The diff has been on tech-kern for several weeks. Reviewed by many, kauth(9) integration reviewed by Elad Efrat; approved by tonnerre@ and tron@. Thanks to everyone who provided feedback. /src/sys/secmodel/files.secmodel - 1.3 Fri Aug 14 21:17:22 UTC 2009 mbalmer branches: 1.2.18; Make securelevel a "secmodel" of its own. While it's true that it's part of the traditional 4.4BSD security model, there may come a time where a different "primary" security model used for fine-grained privileges (ie., splitting root's responsibilities to various privileges that can be assigned) may want to still have a securelevel setting. Idea from Daniel Carosone: http://mail-index.netbsd.org/tech-security/2006/08/25/0001.html The location of the removed files, for reference, was: src/secmodel/bsd44/secmodel_bsd44_securelevel.c src/secmodel/bsd44/securelevel.h /src/sys/secmodel/files.secmodel - 1.2 Wed Nov 21 22:49:07 UTC 2007 elad branches: 1.1.2; 1.1.6; 1.1.10; 1.1.30; 1.1.32; 1.1.36; 1.1.38; First take at security model abstraction. - Add a few scopes to the kernel: system, network, and machdep. - Add a few more actions/sub-actions (requests), and start using them as opposed to the KAUTH_GENERIC_ISSUSER place-holders. - Introduce a basic set of listeners that implement our "traditional" security model, called "bsd44". This is the default (and only) model we have at the moment. - Update all relevant documentation. - Add some code and docs to help folks who want to actually use this stuff: * There's a sample overlay model, sitting on-top of "bsd44", for fast experimenting with tweaking just a subset of an existing model. This is pretty cool because it's *really* straightforward to do stuff you had to use ugly hacks for until now... * And of course, documentation describing how to do the above for quick reference, including code samples. All of these changes were tested for regressions using a Python-based testsuite that will be (I hope) available soon via pkgsrc. Information about the tests, and how to write new ones, can be found on: http://kauth.linbsd.org/kauthwiki NOTE FOR DEVELOPERS: *PLEASE* don't add any code that does any of the following: - Uses a KAUTH_GENERIC_ISSUSER kauth(9) request, - Checks 'securelevel' directly, - Checks a uid/gid directly. (or if you feel you have to, contact me first) This is still work in progress; It's far from being done, but now it'll be a lot easier. Relevant mailing list threads: http://mail-index.netbsd.org/tech-security/2006/01/25/0011.html http://mail-index.netbsd.org/tech-security/2006/03/24/0001.html http://mail-index.netbsd.org/tech-security/2006/04/18/0000.html http://mail-index.netbsd.org/tech-security/2006/05/15/0000.html http://mail-index.netbsd.org/tech-security/2006/08/01/0000.html http://mail-index.netbsd.org/tech-security/2006/08/25/0000.html Many thanks to YAMAMOTO Takashi, Matt Thomas, and Christos Zoulas for help stablizing kauth(9). Full credit for the regression tests, making sure these changes didn't break anything, goes to Matt Fleming and Jaime Fournier. Happy birthday Randi! :) /src/sys/secmodel/files.secmodel - 1.1 Fri Sep 08 20:58:56 UTC 2006 elad Sync with HEAD. /src/sys/secmodel/files.secmodel - 1.1.38.1 Sat Dec 08 18:21:28 UTC 2007 mjf Sync with HEAD /src/sys/secmodel/files.secmodel - 1.1.36.1 Thu Nov 22 15:18:26 UTC 2007 bouyer sync with HEAD /src/sys/secmodel/files.secmodel - 1.1.32.1 Wed Jan 09 01:58:02 UTC 2008 matt Sync with HEAD. amd64 Xen support needs testing. /src/sys/secmodel/files.secmodel - 1.1.30.1 Tue Nov 27 19:39:07 UTC 2007 joerg sync with head /src/sys/secmodel/files.secmodel - 1.1.10.3 Fri Dec 07 17:34:48 UTC 2007 yamt sync with head. /src/sys/secmodel/files.secmodel - 1.1.10.2 Sat Dec 30 20:50:55 UTC 2006 yamt file files.secmodel was added on branch yamt-lazymbuf on 2006-12-30 20:50:55 +0000 /src/sys/secmodel/files.secmodel - 1.1.10.1 Fri Sep 08 20:58:56 UTC 2006 yamt Sync with head. /src/sys/secmodel/files.secmodel - 1.1.6.1 Sat Nov 18 21:39:46 UTC 2006 ad sync with head. /src/sys/secmodel/files.secmodel - 1.1.2.2 Thu Sep 14 00:32:00 UTC 2006 yamt file files.secmodel was added on branch yamt-pdpolicy on 2006-09-14 12:32:00 +0000 /src/sys/secmodel/files.secmodel - 1.1.2.1 Fri Sep 08 20:58:56 UTC 2006 yamt sync with head /src/sys/secmodel/files.secmodel - 1.2.18.2 Thu Mar 11 15:04:40 UTC 2010 yamt sync with head. /src/sys/secmodel/files.secmodel - 1.2.18.1 Wed Aug 19 18:48:31 UTC 2009 yamt merge to -current. /src/sys/secmodel/files.secmodel - 1.4.16.1 Sat Feb 18 07:35:46 UTC 2012 mrg sync with head /src/sys/secmodel/files.secmodel - 1.4.12.1 Tue Apr 17 00:08:50 UTC 2012 yamt