common/c2/audit_path.c

	audit_path.c revision 005d3feb53a9a10272d4a24b03991575d6a9bcb3
/*
 * 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 2010 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*
 * @(#)audit_path.c 2.7 92/02/16 SMI; SunOS CMW
 * @(#)audit_path.c 4.2.1.2 91/05/08 SMI; BSM Module
 *
 * This code does the audit path processes. Part of this is still in
 * audit.c and will be moved here when time permits.
 *
 * Note that audit debuging is enabled here. We will turn it off at
 * beta shipment.
 */

#include <sys/types.h>
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/user.h>
#include <sys/vnode.h>
#include <sys/vfs.h>
#include <sys/kmem.h>       /* for KM_SLEEP */
#include <sys/proc.h>
#include <sys/uio.h>
#include <sys/file.h>
#include <sys/stat.h>
#include <sys/pathname.h>
#include <sys/acct.h>
#include <c2/audit.h>
#include <c2/audit_kernel.h>
#include <c2/audit_record.h>
#include <sys/sysmacros.h>
#include <sys/atomic.h>


int
au_token_size(m)
    token_t *m;
{
    int i;

    if (m == (token_t *)0)
        return (0);

    for (i = 0; m != (token_t *)0; m = m->next_buf)
        i += m->len;
    return (i);
}

token_t *
au_set(cp, size)
    caddr_t  cp;
    uint_t    size;
{
    au_buff_t *head;
    au_buff_t *tail;
    au_buff_t *m;
    uint_t  l;

    head = NULL;
    tail = NULL;    /* only to satisfy lint */

    while (size) {
        m = au_get_buff();
        l = MIN(size, AU_BUFSIZE);
        bcopy(cp, memtod(m, char *), l);
        m->len = l;

        if (head)
            tail->next_buf = m; /* tail set if head set */
        else
            head = m;
        tail = m;
        size -= l;
        cp += l;
    }

    return (head);
}

token_t *
au_append_token(chain, m)
    token_t *chain;
    token_t *m;
{
    token_t *mbp;

    if (chain == (token_t *)0)
        return (m);

    if (m == (token_t *)0)
        return (chain);

    for (mbp = chain; mbp->next_buf != (token_t *)0; mbp = mbp->next_buf)
        ;
    mbp->next_buf = m;
    return (chain);
}


void
audit_fixpath(struct audit_path *app, int len)
{
    int id;     /* index of where we are in destination string */
    int is;     /* index of where we are in source string */
    int cnt;    /* # of levels in audit_path */
    int slashseen;  /* have we seen a slash */
    char *s;    /* start of top-level string */
    char c;

    cnt = app->audp_cnt;
    s = app->audp_sect[cnt - 1];
    is = (app->audp_sect[cnt] - s) - len;
    if (is <= 2)
        is = 0; /* catch leading // or ./ */
    slashseen = (is > 0);
    for (id = is; ; is++) {
        if ((c = s[is]) == '\0') {
            /* that's all folks, we've reached the end of input */
            if (id > 1 && s[id-1] == '/') {
                /* remove terminating / */
                --id;
            }
            s[id++] = '\0';
            break;
        }
        if (slashseen) {
            /* previous character was a / */
            if (c == '/') {
                /* another slash, ignore it */
                continue;
            }
        } else if (c == '/') {
            /* we see a /, just copy it and try again */
            slashseen = 1;
            s[id++] = c;
            continue;
        }
        if (c == '.') {
            if ((c = s[is+1]) == '\0') {
                /* XXX/. seen */
                if (id > 1)
                    id--;
                continue;
            }
            if (c == '/') {
                /* XXX/./ seen */
                is += 1;
                continue;
            }
            if (c == '.' && (s[is+2] == '\0' || s[is+2] == '/')) {
                /* XXX/.. or XXX/../ seen */
                is++;
                if (id == 0 && cnt > 1) {
                    char    *s_attr;
                    /* .. refers to attributed object */
                    app->audp_cnt = --cnt;
                    s_attr = s;
                    s = app->audp_sect[cnt - 1];
                    id = s_attr - s;
                    is += id;
                    id--;
                    slashseen = 0;
                    continue;
                }
                /* backup over previous component */
                if (id > 0)
                    id--;
                while (id > 0 && s[id - 1] != '/')
                    id--;
                continue;
            }
        }
        /* copy component name and terminating /, if any */
        for (;;) {
            c = s[is++];
            if (c == '\0' || c == '/')
                break;
            s[id++] = c;
        }
        /* back up to before terminating '\0' or / */
        slashseen = 0;
        is -= 2;
    }
    /* fill empty attribute directory reference */
    if (id == 1 && cnt > 1) {
        s[0] = '.';
        s[1] = '\0';
        id = 2;
    }
    /* correct end pointer */
    app->audp_sect[cnt] = s + id;
}