sin/samba-mirror
1
0
Fork 0
mirror of https://github.com/samba-team/samba.git synced 2025-02-02 09:47:23 +03:00
Code

new files for head

Browse Source 
(This used to be commit c0d4a1f5dd34e49843c879dd88fc78c7dffd9269)
This commit is contained in:
Andrew Tridgell 2001-04-18 16:42:07 +00:00
parent 9ce5a03ccb
commit 3b4d7082cb
2 changed files with 750 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

175
source3/smbd/session.c Normal file
View File

@ -0,0 +1,175 @@
/*
Unix SMB/Netbios implementation.
Version 2.0
session handling for utmp and PAM
Copyright (C) tridge@samba.org 2001
Copyright (C) abartlet@pcug.org.au 2001
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/* a "session" is claimed when we do a SessionSetupX operation
and is yielded when the corresponding vuid is destroyed.
sessions are used to populate utmp and PAM session structures
*/
#include "includes.h"
#if defined(WITH_PAM) || defined(WITH_UTMP)
static TDB_CONTEXT *tdb;
struct sessionid {
fstring username;
fstring hostname;
fstring id_str;
uint32 id_num;
uint32 pid;
};
/* called when a session is created */
BOOL session_claim(uint16 vuid)
{
user_struct *vuser = get_valid_user_struct(vuid);
int i;
TDB_DATA data;
struct sessionid sessionid;
pstring dbuf;
int dlen;
uint32 pid = (uint32)sys_getpid();
TDB_DATA key;
fstring keystr;
vuser->session_id = 0;
/* don't register sessions for the guest user - its just too
expensive to go through pam session code for browsing etc */
if (strequal(vuser->user.unix_name,lp_guestaccount(-1))) {
return True;
}
if (!tdb) {
tdb = tdb_open(lock_path("sessionid.tdb"), 0, TDB_CLEAR_IF_FIRST,
O_RDWR | O_CREAT, 0644);
if (!tdb) {
DEBUG(1,("session_claim: failed to open sessionid tdb\n"));
return False;
}
}
ZERO_STRUCT(sessionid);
data.dptr = NULL;
data.dsize = 0;
for (i=1;i<MAX_SESSION_ID;i++) {
slprintf(keystr, sizeof(keystr)-1, "ID/%d", i);
key.dptr = keystr;
key.dsize = strlen(keystr)+1;
if (tdb_store(tdb, key, data, TDB_INSERT) == 0) break;
}
if (i == MAX_SESSION_ID) {
DEBUG(1,("session_claim: out of session IDs (max is %d)\n",
MAX_SESSION_ID));
return False;
}
fstrcpy(sessionid.username, vuser->user.unix_name);
fstrcpy(sessionid.hostname, lp_utmp_hostname());
slprintf(sessionid.id_str, sizeof(sessionid.id_str)-1, SESSION_TEMPLATE, i);
sessionid.id_num = i;
sessionid.pid = pid;
dlen = tdb_pack(dbuf, sizeof(dbuf), "fffdd",
sessionid.username, sessionid.hostname, sessionid.id_str,
sessionid.id_num, sessionid.pid);
data.dptr = dbuf;
data.dsize = dlen;
if (tdb_store(tdb, key, data, TDB_MODIFY) != 0) {
DEBUG(1,("session_claim: unable to create session id record\n"));
return False;
}
#if WITH_PAM
if (!pam_session(True, sessionid.username, sessionid.id_str)) {
DEBUG(1,("pam_session rejected the session for %s [%s]\n",
sessionid.username, sessionid.id_str));
tdb_delete(tdb, key);
return False;
}
#endif
#if WITH_UTMP
if (lp_utmp()) {
sys_utmp_claim(sessionid.username, sessionid.hostname,
sessionid.id_str, sessionid.id_num);
}
#endif
vuser->session_id = i;
return True;
}
/* called when a session is destroyed */
void session_yield(uint16 vuid)
{
user_struct *vuser = get_valid_user_struct(vuid);
TDB_DATA data;
struct sessionid sessionid;
TDB_DATA key;
fstring keystr;
if (!tdb) return;
if (vuser->session_id == 0) {
return;
}
slprintf(keystr, sizeof(keystr)-1, "ID/%d", vuser->session_id);
key.dptr = keystr;
key.dsize = strlen(keystr)+1;
data = tdb_fetch(tdb, key);
if (data.dptr == NULL) {
return;
}
tdb_unpack(data.dptr, data.dsize, "fffdd",
&sessionid.username, &sessionid.hostname, &sessionid.id_str,
&sessionid.id_num, &sessionid.pid);
#if WITH_UTMP
if (lp_utmp()) {
sys_utmp_yield(sessionid.username, sessionid.hostname,
sessionid.id_str, sessionid.id_num);
}
#endif
#if WITH_PAM
pam_session(False, sessionid.username, sessionid.id_str);
#endif
tdb_delete(tdb, key);
}
#else
/* null functions - no session support needed */
BOOL session_claim(uint16 vuid) { return True; }
void session_yield(uint16 vuid) {}
#endif

575
source3/smbd/utmp.c Normal file
View File

@ -0,0 +1,575 @@
/*
Unix SMB/Netbios implementation.
Version 2.0
utmp routines
Copyright (C) T.D.Lee@durham.ac.uk 1999
Heavily modified by Andrew Bartlett and Tridge, April 2001
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#ifdef WITH_UTMP
/****************************************************************************
Reflect connection status in utmp/wtmp files.
T.D.Lee@durham.ac.uk September 1999
With grateful thanks since then to many who have helped port it to
different operating systems. The variety of OS quirks thereby
uncovered is amazing...
Hints for porting:
o Always attempt to use programmatic interface (pututline() etc.)
Indeed, at present only programmatic use is supported.
o The only currently supported programmatic interface to "wtmp{,x}"
is through "updwtmp*()" routines.
o The "x" (utmpx/wtmpx; HAVE_UTMPX_H) seems preferable.
o The HAVE_* items should identify supported features.
o If at all possible, avoid "if defined(MY-OS)" constructions.
OS observations and status:
Almost every OS seems to have its own quirks.
Solaris 2.x:
Tested on 2.6 and 2.7; should be OK on other flavours.
AIX:
Apparently has utmpx.h but doesn't implement.
OSF:
Has utmpx.h, but (e.g.) no "getutmpx()". (Is this like AIX ?)
Redhat 6:
utmpx.h seems not to set default filenames. non-x better.
IRIX 6.5:
Not tested. Appears to have "x".
HP-UX 9.x:
Not tested. Appears to lack "x".
HP-UX 10.x:
Not tested.
"updwtmp*()" routines seem absent, so no current wtmp* support.
Has "ut_addr": probably trivial to implement (although remember
that IPv6 is coming...).
FreeBSD:
No "putut*()" type of interface.
No "ut_type" and associated defines.
Write files directly. Alternatively use its login(3)/logout(3).
SunOS 4:
Not tested. Resembles FreeBSD, but no login()/logout().
lastlog:
Should "lastlog" files, if any, be updated?
BSD systems (SunOS 4, FreeBSD):
o Prominent mention on man pages.
System-V (e.g. Solaris 2):
o No mention on man pages, even under "man -k".
o Has a "/var/adm/lastlog" file, but pututxline() etc. seem
not to touch it.
o Despite downplaying (above), nevertheless has <lastlog.h>.
So perhaps UN*X "lastlog" facility is intended for tty/terminal only?
Notes:
Each connection requires a small number (starting at 0, working up)
to represent the line (unum). This must be unique within and across
all smbd processes.
The 4 byte 'ut_id' component is vital to distinguish connections,
of which there could be several hundered or even thousand.
Entries seem to be printable characters, with optional NULL pads.
We need to be distinct from other entries in utmp/wtmp.
Observed things: therefore avoid them. Add to this list please.
From Solaris 2.x (because that's what I have):
'sN' : run-levels; N: [0-9]
'co' : console
'CC' : arbitrary things; C: [a-z]
'rXNN' : rlogin; N: [0-9]; X: [0-9a-z]
'tXNN' : rlogin; N: [0-9]; X: [0-9a-z]
'/NNN' : Solaris CDE
'ftpZ' : ftp (Z is the number 255, aka 0377, aka 0xff)
Mostly a record uses the same 'ut_id' in both "utmp" and "wtmp",
but differences have been seen.
Arbitrarily I have chosen to use a distinctive 'SM' for the
first two bytes.
The remaining two encode the "unum" (see above).
For "utmp consolidate" the suggestion was made to encode the pid into
those remaining two bytes (16 bits). But recent UNIX (e.g Solaris 8)
is migrating to pids > 16 bits, so we ought not to do this.
****************************************************************************/
#include <utmp.h>
#ifdef HAVE_UTMPX_H
#include <utmpx.h>
#endif
/* BSD systems: some may need lastlog.h (SunOS 4), some may not (FreeBSD) */
/* Some System-V systems (e.g. Solaris 2) declare this too. */
#ifdef HAVE_LASTLOG_H
#include <lastlog.h>
#endif
/****************************************************************************
obtain/release a small number (0 upwards) unique within and across smbds
****************************************************************************/
/*
* Need a "small" number to represent this connection, unique within this
* smbd and across all smbds.
*
* claim:
* Start at 0, hunt up for free, unique number "unum" by attempting to
* store it as a key in a tdb database:
* key: unum data: pid+conn
* Also store its inverse, ready for yield function:
* key: pid+conn data: unum
*
* yield:
* Find key: pid+conn; data is unum; delete record
* Find key: unum ; delete record.
*
* Comment:
* The claim algorithm (a "for" loop attempting to store numbers in a tdb
* database) will be increasingly inefficient with larger numbers of
* connections. Is it possible to write a suitable primitive within tdb?
*
* However, by also storing the inverse key/data pair, we at least make
* the yield algorithm efficient.
*/
/****************************************************************************
Default paths to various {u,w}tmp{,x} files
****************************************************************************/
#ifdef HAVE_UTMPX_H
static const char *ux_pathname =
# if defined (UTMPX_FILE)
UTMPX_FILE ;
# elif defined (_UTMPX_FILE)
_UTMPX_FILE ;
# elif defined (_PATH_UTMPX)
_PATH_UTMPX ;
# else
"" ;
# endif
static const char *wx_pathname =
# if defined (WTMPX_FILE)
WTMPX_FILE ;
# elif defined (_WTMPX_FILE)
_WTMPX_FILE ;
# elif defined (_PATH_WTMPX)
_PATH_WTMPX ;
# else
"" ;
# endif
#endif /* HAVE_UTMPX_H */
static const char *ut_pathname =
# if defined (UTMP_FILE)
UTMP_FILE ;
# elif defined (_UTMP_FILE)
_UTMP_FILE ;
# elif defined (_PATH_UTMP)
_PATH_UTMP ;
# else
"" ;
# endif
static const char *wt_pathname =
# if defined (WTMP_FILE)
WTMP_FILE ;
# elif defined (_WTMP_FILE)
_WTMP_FILE ;
# elif defined (_PATH_WTMP)
_PATH_WTMP ;
# else
"" ;
# endif
/* BSD-like systems might want "lastlog" support. */
/* *** Not yet implemented */
#ifndef HAVE_PUTUTLINE /* see "pututline_my()" */
static const char *ll_pathname =
# if defined (_PATH_LASTLOG) /* what other names (if any?) */
_PATH_LASTLOG ;
# else
"" ;
# endif /* _PATH_LASTLOG */
#endif /* HAVE_PUTUTLINE */
/*
* Get name of {u,w}tmp{,x} file.
* return: fname contains filename
* Possibly empty if this code not yet ported to this system.
*
* utmp{,x}: try "utmp dir", then default (a define)
* wtmp{,x}: try "wtmp dir", then "utmp dir", then default (a define)
*/
static void uw_pathname(pstring fname, const char *uw_name, const char *uw_default)
{
pstring dirname;
pstrcpy(dirname, "");
/* For w-files, first look for explicit "wtmp dir" */
if (uw_name[0] == 'w') {
pstrcpy(dirname,lp_wtmpdir());
trim_string(dirname,"","/");
}
/* For u-files and non-explicit w-dir, look for "utmp dir" */
if (dirname == 0 || strlen(dirname) == 0) {
pstrcpy(dirname,lp_utmpdir());
trim_string(dirname,"","/");
}
/* If explicit directory above, use it */
if (dirname != 0 && strlen(dirname) != 0) {
pstrcpy(fname, dirname);
pstrcat(fname, "/");
pstrcat(fname, uw_name);
return;
}
/* No explicit directory: attempt to use default paths */
if (strlen(uw_default) == 0) {
/* No explicit setting, no known default.
* Has it yet been ported to this OS?
*/
DEBUG(2,("uw_pathname: unable to determine pathname\n"));
}
pstrcpy(fname, uw_default);
}
#ifndef HAVE_PUTUTLINE
/****************************************************************************
Update utmp file directly. No subroutine interface: probably a BSD system.
****************************************************************************/
static void pututline_my(pstring uname, struct utmp *u, BOOL claim)
{
DEBUG(1,("pututline_my: not yet implemented\n"));
/* BSD implementor: may want to consider (or not) adjusting "lastlog" */
}
#endif /* HAVE_PUTUTLINE */
#ifndef HAVE_UPDWTMP
/****************************************************************************
Update wtmp file directly. No subroutine interface: probably a BSD system.
Credit: Michail Vidiassov <master@iaas.msu.ru>
****************************************************************************/
static void updwtmp_my(pstring wname, struct utmp *u, BOOL claim)
{
int fd;
struct stat buf;
if (! claim) {
/*
* BSD-like systems:
* may use empty ut_name to distinguish a logout record.
*
* May need "if defined(SUNOS4)" etc. around some of these,
* but try to avoid if possible.
*
* SunOS 4:
* man page indicates ut_name and ut_host both NULL
* FreeBSD 4.0:
* man page appears not to specify (hints non-NULL)
* A correspondent suggest at least ut_name should be NULL
*/
memset((char *)&(u->ut_name), '\0', sizeof(u->ut_name));
memset((char *)&(u->ut_host), '\0', sizeof(u->ut_host));
}
/* Stolen from logwtmp function in libutil.
* May be more locking/blocking is needed?
*/
if ((fd = open(wname, O_WRONLY|O_APPEND, 0)) < 0)
return;
if (fstat(fd, &buf) == 0) {
if (write(fd, (char *)u, sizeof(struct utmp)) != sizeof(struct utmp))
(void) ftruncate(fd, buf.st_size);
}
(void) close(fd);
}
#endif /* HAVE_UPDWTMP */
/****************************************************************************
Update via utmp/wtmp (not utmpx/wtmpx)
****************************************************************************/
static void utmp_nox_update(struct utmp *u, const char *host, BOOL claim)
{
pstring uname, wname;
#if defined(PUTUTLINE_RETURNS_UTMP)
struct utmp *urc;
#endif /* PUTUTLINE_RETURNS_UTMP */
uw_pathname(uname, "utmp", ut_pathname);
DEBUG(2,("utmp_nox_update: uname:%s\n", uname));
#ifdef HAVE_PUTUTLINE
if (strlen(uname) != 0) {
utmpname(uname);
}
# if defined(PUTUTLINE_RETURNS_UTMP)
setutent();
urc = pututline(u);
endutent();
if (urc == NULL) {
DEBUG(2,("utmp_nox_update: pututline() failed\n"));
return;
}
# else /* PUTUTLINE_RETURNS_UTMP */
setutent();
pututline(u);
endutent();
# endif /* PUTUTLINE_RETURNS_UTMP */
#else /* HAVE_PUTUTLINE */
if (strlen(uname) != 0) {
pututline_my(uname, u, claim);
}
#endif /* HAVE_PUTUTLINE */
uw_pathname(wname, "wtmp", wt_pathname);
DEBUG(2,("utmp_nox_update: wname:%s\n", wname));
if (strlen(wname) != 0) {
#ifdef HAVE_UPDWTMP
updwtmp(wname, u);
/*
* updwtmp() and the newer updwtmpx() may be unsymmetrical.
* At least one OS, Solaris 2.x declares the former in the
* "utmpx" (latter) file and context.
* In the Solaris case this is irrelevant: it has both and
* we always prefer the "x" case, so doesn't come here.
* But are there other systems, with no "x", which lack
* updwtmp() perhaps?
*/
#else
updwtmp_my(wname, u, claim);
#endif /* HAVE_UPDWTMP */
}
}
/****************************************************************************
Update via utmpx/wtmpx (preferred) or via utmp/wtmp
****************************************************************************/
static void sys_utmp_update(struct utmp *u, const char *hostname, BOOL claim)
{
#if !defined(HAVE_UTMPX_H)
/* No utmpx stuff. Drop to non-x stuff */
utmp_nox_update(u, hostname, claim);
#elif !defined(HAVE_PUTUTXLINE)
/* Odd. Have utmpx.h but no "pututxline()". Drop to non-x stuff */
DEBUG(1,("utmp_update: have utmpx.h but no pututxline() function\n"));
utmp_nox_update(u, hostname, claim);
#elif !defined(HAVE_GETUTMPX)
/* Odd. Have utmpx.h but no "getutmpx()". Drop to non-x stuff */
DEBUG(1,("utmp_update: have utmpx.h but no getutmpx() function\n"));
utmp_nox_update(u, hostname, claim);
#else
pstring uname, wname;
struct utmpx ux, *uxrc;
getutmpx(u, &ux);
#if defined(HAVE_UX_UT_SYSLEN)
ux.ut_syslen = strlen(hostname) + 1; /* include end NULL */
#endif
safe_strcpy(ux.ut_host, hostname, sizeof(ux.ut_host)-1);
uw_pathname(uname, "utmpx", ux_pathname);
uw_pathname(wname, "wtmpx", wx_pathname);
DEBUG(2,("utmp_update: uname:%s wname:%s\n", uname, wname));
/*
* Check for either uname or wname being empty.
* Some systems, such as Redhat 6, have a "utmpx.h" which doesn't
* define default filenames.
* Also, our local installation has not provided an override.
* Drop to non-x method. (E.g. RH6 has good defaults in "utmp.h".)
*/
if ((strlen(uname) == 0) || (strlen(wname) == 0)) {
utmp_nox_update(u, hostname, claim);
} else {
utmpxname(uname);
setutxent();
uxrc = pututxline(&ux);
endutxent();
if (uxrc == NULL) {
DEBUG(2,("utmp_update: pututxline() failed\n"));
return;
}
updwtmpx(wname, &ux);
}
#endif /* HAVE_UTMPX_H */
}
#if defined(HAVE_UT_UT_ID)
/****************************************************************************
encode the unique connection number into "ut_id"
****************************************************************************/
static int ut_id_encode(int i, char *fourbyte)
{
int nbase;
char *ut_id_encstr = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
fourbyte[0] = 'S';
fourbyte[1] = 'M';
/*
* Encode remaining 2 bytes from 'i'.
* 'ut_id_encstr' is the character set on which modulo arithmetic is done.
* Example: digits would produce the base-10 numbers from '001'.
*/
nbase = strlen(ut_id_encstr);
fourbyte[3] = ut_id_encstr[i % nbase];
i /= nbase;
fourbyte[2] = ut_id_encstr[i % nbase];
i /= nbase;
return(i); /* 0: good; else overflow */
}
#endif /* defined(HAVE_UT_UT_ID) */
/*
fill a system utmp structure given all the info we can gather
*/
static BOOL sys_utmp_fill(struct utmp *u,
const char *username, const char *hostname,
const char *id_str, int id_num)
{
struct timeval timeval;
/*
* ut_name, ut_user:
* Several (all?) systems seems to define one as the other.
* It is easier and clearer simply to let the following take its course,
* rather than to try to detect and optimise.
*/
#if defined(HAVE_UT_UT_USER)
safe_strcpy(u->ut_user, username, sizeof(u->ut_user)-1);
#elif defined(HAVE_UT_UT_NAME)
safe_strcpy(u->ut_name, username, sizeof(u->ut_name)-1);
#endif
/*
* ut_line:
* If size limit proves troublesome, then perhaps use "ut_id_encode()".
*
* Temporary variable "line_tmp" avoids trouble:
* o with unwanted trailing NULL if ut_line full;
* o with overflow if ut_line would be more than full.
*/
if (strlen(id_str) > sizeof(u->ut_line)) {
DEBUG(1,("id_str [%s] is too long for %d char utmp field\n",
id_str, sizeof(u->ut_line)));
return False;
}
memcpy(u->ut_line, id_str, sizeof(u->ut_line));
#if defined(HAVE_UT_UT_PID)
u->ut_pid = sys_getpid();
#endif
/*
* ut_time, ut_tv:
* Some have one, some the other. Many have both, but defined (aliased).
* It is easier and clearer simply to let the following take its course.
* But note that we do the more precise ut_tv as the final assignment.
*/
#if defined(HAVE_UT_UT_TIME)
gettimeofday(&timeval, NULL);
u->ut_time = timeval.tv_sec;
#elif defined(HAVE_UT_UT_TV)
gettimeofday(&timeval, NULL);
u->ut_tv = timeval;
#else
#error "with-utmp must have UT_TIME or UT_TV"
#endif
#if defined(HAVE_UT_UT_HOST)
safe_strcpy(u->ut_host, hostname, sizeof(u->ut_host)-1);
#endif
#if defined(HAVE_UT_UT_ADDR)
/*
* "(unsigned long) ut_addr" apparently exists on at least HP-UX 10.20.
* Volunteer to implement, please ...
*/
#endif
#if defined(HAVE_UT_UT_ID)
if (ut_id_encode(id_num, u->ut_id) != 0) {
DEBUG(1,("utmp_fill: cannot encode id %d\n", id_num));
return False;
}
#endif
return True;
}
/****************************************************************************
close a connection
****************************************************************************/
void sys_utmp_yield(const char *username, const char *hostname,
const char *id_str, int id_num)
{
struct utmp u;
ZERO_STRUCT(u);
#if defined(HAVE_UT_UT_EXIT)
u.ut_exit.e_termination = 0;
u.ut_exit.e_exit = 0;
#endif
#if defined(HAVE_UT_UT_TYPE)
u.ut_type = DEAD_PROCESS;
#endif
if (!sys_utmp_fill(&u, username, hostname, id_str, id_num)) return;
sys_utmp_update(&u, NULL, False);
}
/****************************************************************************
claim a entry in whatever utmp system the OS uses
****************************************************************************/
void sys_utmp_claim(const char *username, const char *hostname,
const char *id_str, int id_num)
{
struct utmp u;
ZERO_STRUCT(u);
#if defined(HAVE_UT_UT_TYPE)
u.ut_type = USER_PROCESS;
#endif
if (!sys_utmp_fill(&u, username, hostname, id_str, id_num)) return;
sys_utmp_update(&u, hostname, True);
}
#else /* WITH_UTMP */
void dummy_utmp(void) {}
#endif