Copy stable/10@r272459 to releng/10.1 as part of
the 10.1-RELEASE process.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Add two new system calls, setloginclass(2) and getloginclass(2). This makes
it possible for the kernel to track login class the process is assigned to,
which is required for RCTL. This change also make setusercontext(3) call
setloginclass(2) and makes it possible to retrieve current login class using
id(1).

Reviewed by: kib (as part of a larger patch)

Since in_lt() and in_lts() are not static, assume that they are intended to
be part of the public API. Accordingly, add prototypes and document them.

Since setclasscpumask() is not static, assume that it is intended to be
part of the public API. Accordingly, add a prototype and document it.

Style and whitespace.

Add support for a new login capability, cpumask which allows login
sessions to be pinned to cpus by login class.

ANSIfy, WARNSify, CONSTify. Bit of style(9)-ify.

Add LOGIN_SETMAC, which will indicate to the user context management code
that it should also set the user's default MAC label, if available and
permitted.

Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs

Whitespace cleanup--it's not style(9), but it is consistent. Prep
for MAC-related commits to the login infrastructure.

Obtained from: TrustedBSD Project
Sponsored by: DARPA, NAI Labs

Const poisoning.

Remove __P() usage.

Add working and easy crypt(3)-switching. Yes, we need a whole new API
for crypt(3) by now. In any case:

Add crypt_set_format(3) + documentation to -lcrypt.
Add login_setcryptfmt(3) + documentation to -lutil.
Support for switching crypt formats in passwd(8).
Support for switching crypt formats in pw(8).

The simple synopsis is:
edit login.conf; add a passwd_format field set to "des" or "md5"; go nuts :)

Reviewed by: peter

$Id$ -> $FreeBSD$

Summary of login.conf support changes:

o Incorporated BSDI code and enhancements, better logging for error
checking (which has been shown to be a problem, and is therefore
justified, imho); also some minor things we were missing, including
better quad_t math, which checks for under/overflows.

o setusercontext() now allows user resource limit overrides, but
does this AFTER dropping root privs, to restrict the user to
droping hard limits and set soft limits within the kernel's
allowed user limits.

o umask() only set once, and only if requested.

o add _secure_path(), and use in login.conf to guard against
symlinks etc. and non-root owned or non-user owned files being
used. Derived from BSDI contributed code.

o revamped authentication code to BSDI's latest api, which
includes deleting authenticate() and adding auth_check()
and a few other functions. This is still marked as depecated
in BSDI, but is included for completeness. No other source
in the tree uses this anyway, so it is now bracketed with
#ifdef LOGIN_CAP_AUTH which is by default not defined. Only
auth_checknologin() and auth_cat() are actually used in
module login_auth.c.

o AUTH_NONE definition removed (collided with other includes
in the tree). [bde]

o BSDI's login_getclass() now accepts a char *classname
parameter rather than struct passwd *pwd. We now do likewise,
but added login_getpwclass() for (sort of) backwards
compatiblity, namely because we handle root as a special
case for the default class. This will require quite a few
changes elsewhere in the source tree.

o We no longer pretend to support rlim_t as a long type.

o Revised code formatting to be more bsd-ish style.

Move login_cap.h from src/include for easier maintenance with
related files.