mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-19 10:53:58 +00:00
800c940832
privilege for threads and credentials. Unlike the existing suser(9) interface, priv(9) exposes a named privilege identifier to the privilege checking code, allowing more complex policies regarding the granting of privilege to be expressed. Two interfaces are provided, replacing the existing suser(9) interface: suser(td) -> priv_check(td, priv) suser_cred(cred, flags) -> priv_check_cred(cred, priv, flags) A comprehensive list of currently available kernel privileges may be found in priv.h. New privileges are easily added as required, but the comments on adding privileges found in priv.h and priv(9) should be read before doing so. The new privilege interface exposed sufficient information to the privilege checking routine that it will now be possible for jail to determine whether a particular privilege is granted in the check routine, rather than relying on hints from the calling context via the SUSER_ALLOWJAIL flag. For now, the flag is maintained, but a new jail check function, prison_priv_check(), is exposed from kern_jail.c and used by the privilege check routine to determine if the privilege is permitted in jail. As a result, a centralized list of privileges permitted in jail is now present in kern_jail.c. The MAC Framework is now also able to instrument privilege checks, both to deny privileges otherwise granted (mac_priv_check()), and to grant privileges otherwise denied (mac_priv_grant()), permitting MAC Policy modules to implement privilege models, as well as control a much broader range of system behavior in order to constrain processes running with root privilege. The suser() and suser_cred() functions remain implemented, now in terms of priv_check() and the PRIV_ROOT privilege, for use during the transition and possibly continuing use by third party kernel modules that have not been updated. The PRIV_DRIVER privilege exists to allow device drivers to check privilege without adopting a more specific privilege identifier. This change does not modify the actual security policy, rather, it modifies the interface for privilege checks so changes to the security policy become more feasible. Sponsored by: nCircle Network Security, Inc. Obtained from: TrustedBSD Project Discussed on: arch@ Reviewed (at least in part) by: mlaier, jmg, pjd, bde, ceri, Alex Lyashkov <umka at sevcity dot net>, Skip Ford <skip dot ford at verizon dot net>, Antoine Brodin <antoine dot brodin at laposte dot net> |
||
|---|---|---|
| .. | ||
| amd64 | ||
| arm | ||
| boot | ||
| bsm | ||
| cam | ||
| coda | ||
| compat | ||
| conf | ||
| contrib | ||
| crypto | ||
| ddb | ||
| dev | ||
| fs | ||
| gdb | ||
| geom | ||
| gnu | ||
| i4b | ||
| i386 | ||
| ia64 | ||
| isa | ||
| isofs/cd9660 | ||
| kern | ||
| libkern | ||
| modules | ||
| net | ||
| net80211 | ||
| netatalk | ||
| netatm | ||
| netgraph | ||
| netinet | ||
| netinet6 | ||
| netipsec | ||
| netipx | ||
| netkey | ||
| netnatm | ||
| netncp | ||
| netsmb | ||
| nfs | ||
| nfs4client | ||
| nfsclient | ||
| nfsserver | ||
| opencrypto | ||
| pc98 | ||
| pccard | ||
| pci | ||
| posix4 | ||
| powerpc | ||
| rpc | ||
| security | ||
| sparc64 | ||
| sun4v | ||
| sys | ||
| tools | ||
| ufs | ||
| vm | ||
| Makefile | ||