bsd-cray.c

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/* 
 * $Id: bsd-cray.c,v 1.14 2005/02/02 06:10:11 dtucker Exp $
 *
 * bsd-cray.c
 *
 * Copyright (c) 2002, Cray Inc.  (Wendy Palm <[e-mail]>)
 * Significant portions provided by 
 *          Wayne Schroeder, SDSC <[e-mail]>
 *          William Jones, UTexas <[e-mail]>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Created: Apr 22 16.34:00 2002 wp
 *
 * This file contains functions required for proper execution
 * on UNICOS systems.
 *
 */
#ifdef _UNICOS

#include <udb.h>
#include <tmpdir.h>
#include <unistd.h>
#include <sys/category.h>
#include <utmp.h>
#include <sys/jtab.h>
#include <signal.h>
#include <sys/priv.h>
#include <sys/secparm.h>
#include <sys/tfm.h>
#include <sys/usrv.h>
#include <sys/sysv.h>
#include <sys/sectab.h>
#include <sys/secstat.h>
#include <sys/stat.h>
#include <sys/session.h>
#include <stdlib.h>
#include <pwd.h>
#include <fcntl.h>
#include <errno.h>
#include <ia.h>
#include <urm.h>
#include "ssh.h"

#include "includes.h"
#include "sys/types.h"

#ifndef HAVE_STRUCT_SOCKADDR_STORAGE
# define      _SS_MAXSIZE     128     /* Implementation specific max size */
# define       _SS_PADSIZE     (_SS_MAXSIZE - sizeof (struct sockaddr))

# define ss_family ss_sa.sa_family
#endif /* !HAVE_STRUCT_SOCKADDR_STORAGE */

#ifndef IN6_IS_ADDR_LOOPBACK
# define IN6_IS_ADDR_LOOPBACK(a) \
	(((u_int32_t *) (a))[0] == 0 && ((u_int32_t *) (a))[1] == 0 && \
	 ((u_int32_t *) (a))[2] == 0 && ((u_int32_t *) (a))[3] == htonl (1))
#endif /* !IN6_IS_ADDR_LOOPBACK */

#ifndef AF_INET6
/* Define it to something that should never appear */
#define AF_INET6 AF_MAX
#endif

#include "log.h"
#include "servconf.h"
#include "bsd-cray.h"

#define MAXACID 80

extern ServerOptions options;

char cray_tmpdir[TPATHSIZ + 1];		    /* job TMPDIR path */

struct sysv sysv;	/* system security structure */
struct usrv usrv;	/* user security structure */

/*
 * Functions.
 */
void cray_retain_utmp(struct utmp *, int);
void cray_delete_tmpdir(char *, int, uid_t);
void cray_init_job(struct passwd *);
void cray_set_tmpdir(struct utmp *);
void cray_login_failure(char *, int);
int cray_setup(uid_t, char *, const char *);
int cray_access_denied(char *);

void
cray_login_failure(char *username, int errcode)
{
	struct udb *ueptr;		/* UDB pointer for username */
	ia_failure_t fsent;		/* ia_failure structure */
	ia_failure_ret_t fret;		/* ia_failure return stuff */
	struct jtab jtab;		/* job table structure */
	int jid = 0;			/* job id */

	if ((jid = getjtab(&jtab)) < 0)
		debug("cray_login_failure(): getjtab error");

	getsysudb();
	if ((ueptr = getudbnam(username)) == UDB_NULL)
		debug("cray_login_failure(): getudbname() returned NULL");
	endudb();

	memset(&fsent, '\0', sizeof(fsent));
	fsent.revision = 0;
	fsent.uname = username;
	fsent.host = (char *)get_canonical_hostname(options.use_dns);
	fsent.ttyn = "sshd";
	fsent.caller = IA_SSHD;
	fsent.flags = IA_INTERACTIVE;
	fsent.ueptr = ueptr;
	fsent.jid = jid;
	fsent.errcode = errcode;
	fsent.pwdp = NULL;
	fsent.exitcode = 0;	/* dont exit in ia_failure() */

	fret.revision = 0;
	fret.normal = 0;

	/*
	 * Call ia_failure because of an login failure.
	 */
	ia_failure(&fsent, &fret);
}

/*
 *  Cray access denied
 */
int
cray_access_denied(char *username)
{
	struct udb *ueptr;		/* UDB pointer for username */
	int errcode;			/* IA errorcode */

	errcode = 0;
	getsysudb();
	if ((ueptr = getudbnam(username)) == UDB_NULL)
		debug("cray_login_failure(): getudbname() returned NULL");
	endudb();

	if (ueptr != NULL && ueptr->ue_disabled)
		errcode = IA_DISABLED;
	if (errcode)
		cray_login_failure(username, errcode);

	return (errcode);
}

/*
 * record_failed_login: generic "login failed" interface function
 */
void
record_failed_login(const char *user, const char *hostname, const char *ttyname)
{
	cray_login_failure((char *)user, IA_UDBERR);
}

int
cray_setup (uid_t uid, char *username, const char *command)
{
	extern struct udb *getudb();
	extern char *setlimits();

	int err;			/* error return */
	time_t system_time;		/* current system clock */
	time_t expiration_time;		/* password expiration time */
	int maxattempts;		/* maximum no. of failed login attempts */
	int SecureSys;			/* unicos security flag */
	int minslevel = 0;		/* system minimum security level */
	int i, j;
	int valid_acct = -1;		/* flag for reading valid acct */
	char acct_name[MAXACID] = { "" }; /* used to read acct name */
	struct jtab jtab;		/* Job table struct */
	struct udb ue;			/* udb entry for logging-in user */
	struct udb *up;			/* pointer to UDB entry */
	struct secstat secinfo;		/* file  security attributes */
	struct servprov init_info;	/* used for sesscntl() call */
	int jid;			/* job ID */
	int pid;			/* process ID */
	char *sr;			/* status return from setlimits() */
	char *ttyn = NULL;		/* ttyname or command name*/
	char hostname[MAXHOSTNAMELEN];
	/* passwd stuff for ia_user */
	passwd_t pwdacm, pwddialup, pwdudb, pwdwal, pwddce;
	ia_user_ret_t uret;		/* stuff returned from ia_user */
	ia_user_t usent;		/* ia_user main structure */
	int ia_rcode;			/* ia_user return code */
	ia_failure_t fsent;		/* ia_failure structure */
	ia_failure_ret_t fret;		/* ia_failure return stuff */
	ia_success_t ssent;		/* ia_success structure */
	ia_success_ret_t sret;		/* ia_success return stuff */
	int ia_mlsrcode;		/* ia_mlsuser return code */
	int secstatrc;			/* [f]secstat return code */

	if (SecureSys = (int)sysconf(_SC_CRAY_SECURE_SYS)) {
		getsysv(&sysv, sizeof(struct sysv));
		minslevel = sysv.sy_minlvl;
		if (getusrv(&usrv) < 0)
			fatal("getusrv() failed, errno = %d", errno);
	}
	hostname[0] = '\0';
	strlcpy(hostname,
	   (char *)get_canonical_hostname(options.use_dns),
	   MAXHOSTNAMELEN);
	/*
	 *  Fetch user's UDB entry.
	 */
	getsysudb();
	if ((up = getudbnam(username)) == UDB_NULL)
		fatal("cannot fetch user's UDB entry");

	/*
	 *  Prevent any possible fudging so perform a data
	 *  safety check and compare the supplied uid against
	 *  the udb's uid.
	 */
	if (up->ue_uid != uid)
		fatal("IA uid missmatch");
	endudb();

	if ((jid = getjtab(&jtab)) < 0) {
		debug("getjtab");
		return(-1);
	}
	pid = getpid();
	ttyn = ttyname(0);
	if (SecureSys) {
		if (ttyn != NULL)
			secstatrc = secstat(ttyn, &secinfo);
		else
			secstatrc = fsecstat(1, &secinfo);

		if (secstatrc == 0)
			debug("[f]secstat() successful");
		else
			fatal("[f]secstat() error, rc = %d", secstatrc);
	}
	if ((ttyn == NULL) && ((char *)command != NULL))
		ttyn = (char *)command;
	/*
	 *  Initialize all structures to call ia_user
	 */
	usent.revision = 0;
	usent.uname = username;
	usent.host = hostname;
	usent.ttyn = ttyn;
	usent.caller = IA_SSHD; 
	usent.pswdlist = &pwdacm;
	usent.ueptr = &ue;
	usent.flags = IA_INTERACTIVE | IA_FFLAG;
	pwdacm.atype = IA_SECURID;
	pwdacm.pwdp = NULL;
	pwdacm.next = &pwdudb;

	pwdudb.atype = IA_UDB;
	pwdudb.pwdp = NULL;
	pwdudb.next = &pwddce;

	pwddce.atype = IA_DCE;
	pwddce.pwdp = NULL;
	pwddce.next = &pwddialup;

	pwddialup.atype = IA_DIALUP;
	pwddialup.pwdp = NULL;
	/* pwddialup.next = &pwdwal; */
	pwddialup.next = NULL;

	pwdwal.atype = IA_WAL;
	pwdwal.pwdp = NULL;
	pwdwal.next = NULL;

	uret.revision = 0;
	uret.pswd = NULL;
	uret.normal = 0;

	ia_rcode = ia_user(&usent, &uret);
	switch (ia_rcode) {
	/*
	 *  These are acceptable return codes from ia_user()
	 */
	case IA_UDBWEEK:        /* Password Expires in 1 week */
		expiration_time = ue.ue_pwage.time + ue.ue_pwage.maxage;
		printf ("WARNING - your current password will expire %s\n",
		ctime((const time_t *)&expiration_time));
		break;
	case IA_UDBEXPIRED:
		if (ttyname(0) != NULL) {
			/* Force a password change */
			printf("Your password has expired; Choose a new one.\n");
			execl("/bin/passwd", "passwd", username, 0);
			exit(9);
			}
		break;
	case IA_NORMAL:         /* Normal Return Code */
		break;
	case IA_BACKDOOR:
		/* XXX: can we memset it to zero here so save some of this */
		strlcpy(ue.ue_name, "root", sizeof(ue.ue_name));
		strlcpy(ue.ue_dir, "/", sizeof(ue.ue_dir));
		strlcpy(ue.ue_shell, "/bin/sh", sizeof(ue.ue_shell));

		ue.ue_passwd[0] = '\0';
		ue.ue_age[0] = '\0';
		ue.ue_comment[0] = '\0';
		ue.ue_loghost[0] = '\0';
		ue.ue_logline[0] = '\0';

		ue.ue_uid = -1;
		ue.ue_nice[UDBRC_INTER] = 0;

		for (i = 0; i < MAXVIDS; i++)
			ue.ue_gids[i] = 0;

		ue.ue_logfails = 0;
		ue.ue_minlvl = ue.ue_maxlvl = ue.ue_deflvl = minslevel;
		ue.ue_defcomps = 0;
		ue.ue_comparts = 0;
		ue.ue_permits = 0;
		ue.ue_trap = 0;
		ue.ue_disabled = 0;
		ue.ue_logtime = 0;
		break;
	case IA_CONSOLE:        /* Superuser not from Console */
	case IA_TRUSTED:	/* Trusted user */
		if (options.permit_root_login > PERMIT_NO)
			break;	/* Accept root login */
	default:
	/*
	 *  These are failed return codes from ia_user()
	 */
		switch (ia_rcode) 
		{
		case IA_BADAUTH:
			printf("Bad authorization, access denied.\n");
			break;
		case IA_DISABLED:
			printf("Your login has been disabled. Contact the system ");
			printf("administrator for assistance.\n");
			break;
		case IA_GETSYSV:
			printf("getsysv() failed - errno = %d\n", errno);
			break;
		case IA_MAXLOGS:
			printf("Maximum number of failed login attempts exceeded.\n");
			printf("Access denied.\n");
			break;
		case IA_UDBPWDNULL:
			if (SecureSys)
				printf("NULL Password not allowed on MLS systems.\n");
			break;
		default:
			break;
		}

		/*
		 *  Authentication failed.
		 */
		printf("sshd: Login incorrect, (0%o)\n",
		    ia_rcode-IA_ERRORCODE);

		/*
		 *  Initialize structure for ia_failure
		 *  which will exit.
		 */
		fsent.revision = 0;
		fsent.uname = username;
		fsent.host = hostname;
		fsent.ttyn = ttyn;
		fsent.caller = IA_SSHD;
		fsent.flags = IA_INTERACTIVE;
		fsent.ueptr = &ue;
		fsent.jid = jid;
		fsent.errcode = ia_rcode;
		fsent.pwdp = uret.pswd;
		fsent.exitcode = 1;

		fret.revision = 0;
		fret.normal = 0;

		/*
		*  Call ia_failure because of an IA failure.
		*  There is no return because ia_failure exits.
		*/
		ia_failure(&fsent, &fret);

		exit(1); 
	}