cmd/uadmin/uadmin.c

	uadmin.c revision 193974072f41a843678abf5f61979c748687e66b
/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License (the "License").
 * You may not use this file except in compliance with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*  Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
/*    All Rights Reserved   */


#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <signal.h>
#include <unistd.h>

#include <bsm/adt.h>
#include <bsm/adt_event.h>

#include <sys/types.h>
#include <sys/uadmin.h>
#include <sys/wait.h>

#define SMF_RST "/etc/svc/volatile/resetting"
#define RETRY_COUNT 15  /* number of 1 sec retries for audit(1M) to complete */

static const char *Usage = "Usage: %s cmd fcn [mdep]\n";

static int closeout_audit(int, int);
static int turnoff_auditd(void);
static void wait_for_auqueue();
static int change_audit_file(void);

int
main(int argc, char *argv[])
{
    int cmd, fcn;
    uintptr_t mdep = NULL;
    sigset_t set;
    adt_session_data_t *ah;  /* audit session handle */
    adt_event_data_t *event = NULL; /* event to be generated */
    au_event_t event_id;
    enum adt_uadmin_fcn fcn_id;

    if (argc < 3 || argc > 4) {
        (void) fprintf(stderr, Usage, argv[0]);
        return (1);
    }

    (void) sigfillset(&set);
    (void) sigprocmask(SIG_BLOCK, &set, NULL);

    cmd = atoi(argv[1]);
    fcn = atoi(argv[2]);
    if (argc == 4) {    /* mdep argument given */
        if (cmd != A_REBOOT && cmd != A_SHUTDOWN && cmd != A_DUMP &&
            cmd != A_FREEZE) {
            (void) fprintf(stderr, "%s: mdep argument not "
                "allowed for this cmd value\n", argv[0]);
            (void) fprintf(stderr, Usage, argv[0]);
            return (1);
        } else {
            mdep = (uintptr_t)argv[3];
        }
    }

    /* set up audit session and event */
    if (adt_start_session(&ah, NULL, ADT_USE_PROC_DATA) != 0) {
        (void) fprintf(stderr, "%s: can't start audit session\n",
            argv[0]);
    }
    switch (cmd) {
    case A_SHUTDOWN:
        event_id = ADT_uadmin_shutdown;
        break;
    case A_REBOOT:
        event_id = ADT_uadmin_reboot;
        break;
    case A_DUMP:
        event_id = ADT_uadmin_dump;
        break;
    case A_REMOUNT:
        event_id = ADT_uadmin_remount;
        break;
    case A_FREEZE:
        event_id = ADT_uadmin_freeze;
        break;
    case A_FTRACE:
        event_id = ADT_uadmin_ftrace;
        break;
    case A_SWAPCTL:
        event_id = ADT_uadmin_swapctl;
        break;
    default:
        event_id = 0;
    }
    if ((event_id != 0) &&
        (event = adt_alloc_event(ah, event_id)) == NULL) {
        (void) fprintf(stderr, "%s: can't allocate audit event\n",
            argv[0]);
    }
    switch (fcn) {
    case AD_HALT:
        fcn_id = ADT_UADMIN_FCN_AD_HALT;
        break;
    case AD_POWEROFF:
        fcn_id = ADT_UADMIN_FCN_AD_POWEROFF;
        break;
    case AD_BOOT:
        fcn_id = ADT_UADMIN_FCN_AD_BOOT;
        break;
    case AD_IBOOT:
        fcn_id = ADT_UADMIN_FCN_AD_IBOOT;
        break;
    case AD_SBOOT:
        fcn_id = ADT_UADMIN_FCN_AD_SBOOT;
        break;
    case AD_SIBOOT:
        fcn_id = ADT_UADMIN_FCN_AD_SIBOOT;
        break;
    case AD_NOSYNC:
        fcn_id = ADT_UADMIN_FCN_AD_NOSYNC;
        break;
    case AD_FASTREBOOT:
#ifdef __i386
        fcn_id = ADT_UADMIN_FCN_AD_FASTREBOOT;
        mdep = NULL;    /* Ignore all arguments */
#else
        fcn = AD_BOOT;
        fcn_id = ADT_UADMIN_FCN_AD_BOOT;
#endif /* __i386 */
        break;
    case AD_FASTREBOOT_DRYRUN:
        fcn_id = ADT_UADMIN_FCN_AD_FASTREBOOT_DRYRUN;
        mdep = NULL;    /* Ignore all arguments */
        break;
    default:
        fcn_id = 0;
    }
    if (cmd == A_FREEZE) {
        switch (fcn) {
        case AD_SUSPEND_TO_DISK:
            fcn_id = ADT_UADMIN_FCN_AD_SUSPEND_TO_DISK;
            break;
        case AD_CHECK_SUSPEND_TO_DISK:
            fcn_id = ADT_UADMIN_FCN_AD_CHECK_SUSPEND_TO_DISK;
            break;
        case AD_FORCE:
            fcn_id = ADT_UADMIN_FCN_AD_FORCE;
            break;
        case AD_SUSPEND_TO_RAM:
            fcn_id = ADT_UADMIN_FCN_AD_SUSPEND_TO_RAM;
            break;
        case AD_CHECK_SUSPEND_TO_RAM:
            fcn_id = ADT_UADMIN_FCN_AD_CHECK_SUSPEND_TO_RAM;
            break;
        case AD_REUSEINIT:
            fcn_id = ADT_UADMIN_FCN_AD_REUSEINIT;
            break;
        case AD_REUSABLE:
            fcn_id = ADT_UADMIN_FCN_AD_REUSABLE;
            break;
        case AD_REUSEFINI:
            fcn_id = ADT_UADMIN_FCN_AD_REUSEFINI;
            break;
        }
    } else if (cmd == A_FTRACE) {
        switch (fcn) {
        case AD_FTRACE_START:
            fcn_id = ADT_UADMIN_FCN_AD_FTRACE_START;
            break;
        case AD_FTRACE_STOP:
            fcn_id = ADT_UADMIN_FCN_AD_FTRACE_STOP;
            break;
        }
    }

    if (geteuid() == 0) {
        if (event != NULL) {
            switch (cmd) {
            case A_SHUTDOWN:
                event->adt_uadmin_shutdown.fcn = fcn_id;
                event->adt_uadmin_shutdown.mdep = (char *)mdep;
                break;
            case A_REBOOT:
                event->adt_uadmin_reboot.fcn = fcn_id;
                event->adt_uadmin_reboot.mdep = (char *)mdep;
                break;
            case A_DUMP:
                event->adt_uadmin_dump.fcn = fcn_id;
                event->adt_uadmin_dump.mdep = (char *)mdep;
                break;
            case A_REMOUNT:
                /* no parameters */
                break;
            case A_FREEZE:
                event->adt_uadmin_freeze.fcn = fcn_id;
                event->adt_uadmin_freeze.mdep = (char *)mdep;
                break;
            case A_FTRACE:
                event->adt_uadmin_ftrace.fcn = fcn_id;
                break;
            case A_SWAPCTL:
                event->adt_uadmin_swapctl.fcn = fcn_id;
                break;
            }

            if (adt_put_event(event, ADT_SUCCESS, 0) != 0) {
                (void) fprintf(stderr,
                    "%s: can't put audit event\n", argv[0]);
            }
            /*
             * allow audit record to be processed in the kernel
             * audit queue
             */
            wait_for_auqueue();
        }

        if (closeout_audit(cmd, fcn) == -1)
            (void) fprintf(stderr, "%s: can't turn off auditd\n",
                argv[0]);

        if (cmd == A_SHUTDOWN || cmd == A_REBOOT)
            (void) creat(SMF_RST, 0777);
    }

    (void) adt_free_event(event);
    if (uadmin(cmd, fcn, mdep) < 0) {
        perror("uadmin");

        (void) unlink(SMF_RST);

        return (1);
    }

    /* If returning from a suspend, audit thaw */
    if ((cmd == A_FREEZE) &&
        ((fcn == AD_FORCE) ||
        (fcn == AD_REUSABLE) ||
        (fcn == AD_SUSPEND_TO_DISK) ||
        (fcn == AD_SUSPEND_TO_RAM))) {
        if ((event = adt_alloc_event(ah, ADT_uadmin_thaw)) == NULL) {
            (void) fprintf(stderr, "%s: can't allocate thaw audit "
                "event\n", argv[0]);
        }
        event->adt_uadmin_thaw.fcn = fcn_id;
        if (adt_put_event(event, ADT_SUCCESS, 0) != 0) {
            (void) fprintf(stderr, "%s: can't put thaw audit "
                "event\n", argv[0]);
        }
        (void) adt_free_event(event);
    }
    (void) adt_end_session(ah);

    return (0);
}

static int
closeout_audit(int cmd, int fcn)
{
    if (!adt_audit_state(AUC_AUDITING)) {
        /* auditd not running, just return */
        return (0);
    }
    switch (cmd) {
    case A_SHUTDOWN:
        switch (fcn) {
        case AD_FASTREBOOT_DRYRUN:
            /* No system discontinuity, don't turn off auditd */
            return (0);
        default:
            break;  /* For all the other shutdown functions */
        }
        /* FALLTHROUGH */
    case A_REBOOT:
    case A_DUMP:
        /* system shutting down, turn off auditd */
        return (turnoff_auditd());
    case A_REMOUNT:
    case A_SWAPCTL:
    case A_FTRACE:
        /* No system discontinuity, don't turn off auditd */
        return (0);
    case A_FREEZE:
        switch (fcn) {
        case AD_CHECK_SUSPEND_TO_DISK:  /* AD_CHECK */
        case AD_CHECK_SUSPEND_TO_RAM:
        case AD_REUSEINIT:
        case AD_REUSEFINI:
            /* No system discontinuity, don't turn off auditd */
            return (0);
        case AD_REUSABLE:
        case AD_SUSPEND_TO_DISK:    /* AD_COMPRESS */
        case AD_SUSPEND_TO_RAM:
        case AD_FORCE:
            /* suspend the system, change audit files */
            return (change_audit_file());
        default:
            return (0); /* not an audit error */
        }
    default:
        return (0); /* not an audit error */
    }
}

static int
turnoff_auditd(void)
{
    int rc;
    int retries = RETRY_COUNT;

    if ((rc = (int)fork()) == 0) {
        (void) execl("/usr/sbin/audit", "audit", "-t", NULL);
        (void) fprintf(stderr, "error disabling auditd: %s\n",
            strerror(errno));
        _exit(-1);
    } else if (rc == -1) {
        (void) fprintf(stderr, "error disabling auditd: %s\n",
            strerror(errno));
        return (-1);
    }

    /*
     * wait for auditd to finish its work.  auditd will change the
     * auditstart from AUC_AUDITING (auditd up and running) to
     * AUC_NOAUDIT.  Other states are errors, so we're done as well.
     */
    do {
        int auditstate;

        rc = -1;
        if ((auditon(A_GETCOND, (caddr_t)&auditstate,
            sizeof (auditstate)) == 0) &&
            (auditstate == AUC_AUDITING)) {
            retries--;
            (void) sleep(1);
        } else {
            rc = 0;
        }
    } while ((rc != 0) && (retries != 0));

    return (rc);
}

static int
change_audit_file(void)
{
    pid_t   pid;

    if ((pid = fork()) == 0) {
        (void) execl("/usr/sbin/audit", "audit", "-n", NULL);
        (void) fprintf(stderr, "error changing audit files: %s\n",
            strerror(errno));
        _exit(-1);
    } else if (pid == -1) {
        (void) fprintf(stderr, "error changing audit files: %s\n",
            strerror(errno));
        return (-1);
    } else {
        pid_t   rc;
        int retries = RETRY_COUNT;

        /*
         * Wait for audit(1M) -n process to complete
         *
         */
        do {
            if ((rc = waitpid(pid, NULL, WNOHANG)) == pid) {
                return (0);
            } else if (rc == -1) {
                return (-1);
            } else {
                (void) sleep(1);
                retries--;
            }

        } while (retries != 0);
    }
    return (-1);
}

static void
wait_for_auqueue()
{
    au_stat_t   au_stat;
    int     retries = 10;

    while (retries-- && auditon(A_GETSTAT, (caddr_t)&au_stat, NULL) == 0) {
        if (au_stat.as_enqueue == au_stat.as_written) {
            break;
        }
        (void) sleep(1);
    }
}