lib/libnisdb/ldap_parse.c

/*
 * 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 (c) 2001, 2010, Oracle and/or its affiliates. All rights reserved.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/param.h>
#include <errno.h>
#include <string.h>
#include <strings.h>
#include <ctype.h>
#include <malloc.h>
#include <stdlib.h>
#include <deflt.h>
#include <limits.h>

#include "ldap_parse.h"
#include "ldap_glob.h"
#include "ldap_attr.h"
#include "ldap_util.h"
#include "ldap_map.h"
#include "ldap_ruleval.h"
#include "nis_parse_ldap_conf.h"

int yp2ldap = 0;
/*
 * List of mapping structures in original (i.e., as in config file) order.
 * Lined on the 'seqNext' field.
 */
__nis_table_mapping_t   *ldapMappingSeq = 0;

/*
 * Call the parser for the config file 'ldapConfFile', and command line
 * attribute settings per 'ldapCLA'.
 *
 * Returns
 *  0   Success
 *  -1  Config file stat/open or parse error
 *  1   No mapping should be used.
 */
int
parseConfig(char **ldapCLA, char *ldapConfFile) {
    int     ret;

    /*
     * Establish defaults for ldapDBTableMapping, so that we have
     * valid values even if there's no mapping config to parse.
     */
    ldapDBTableMapping.initTtlLo = (3600-1800);
    ldapDBTableMapping.initTtlHi = (3600+1800);
    ldapDBTableMapping.ttl = 3600;
    ldapDBTableMapping.enumExpire = 0;
    ldapDBTableMapping.fromLDAP = FALSE;
    ldapDBTableMapping.toLDAP = FALSE;
    ldapDBTableMapping.expire = 0;

    ret = parse_ldap_migration((const char **)ldapCLA, ldapConfFile);

    return (ret);
}

/*
 * Convert the linked list of __nis_table_mapping_t's (produced by the
 * attribute parser) to the 'ldapMappingList', keyed on the objPath.
 *
 * Once this function has returned, the 'tlist' is invalid, and must
 * not be used in any way.
 */
int
linked2hash(__nis_table_mapping_t *tlist) {
    __nis_hash_table_mt dbids;
    __nis_table_mapping_t   *t, *told, *x, **seqNext;
    __nis_object_dn_t   *o, *to;
    const char      *myself = "linked2hash";
#ifdef  NISDB_LDAP_DEBUG
    char            *selectDbid = getenv("NISLDAPSELECTDBID");
    char            **sdi, *s;
    int         i, nsdi;
#endif  /* NISDB_LDAP_DEBUG */


    if (tlist == 0)
        return (0);

    /* proxyInfo.default_nis_domain must end in a dot */
    {
        int len = slen(proxyInfo.default_nis_domain);

        if (len > 0 && proxyInfo.default_nis_domain[len-1] != '.') {
            char    *domain = am(myself, len+2);

            (void) memcpy(domain, proxyInfo.default_nis_domain,
                    len);
            domain[len] = '.';
            domain[len+1] = '\0';
            sfree(proxyInfo.default_nis_domain);
            proxyInfo.default_nis_domain = domain;
        }
    }

#ifdef  NISDB_LDAP_DEBUG
    for (nsdi = 0, s = selectDbid; s != 0 && *s != '\0'; s++) {
        if (*s != ' ') {
            nsdi++;
            while (*s != ' ' && *s != '\0')
                s++;
            if (*s == '\0')
                break;
        }
    }
    if (nsdi > 0) {
        sdi = am(myself, nsdi * sizeof (sdi[0]));
        if (sdi == 0)
            logmsg(MSG_NOTIMECHECK, LOG_WARNING,
                "%s: Memory alloc failure for dbId selection",
                myself);
        else {
            for (i = 0, s = selectDbid; *s != '\0'; s++) {
                if (*s != ' ') {
                    sdi[i++] = selectDbid;
                    while (*s != ' ' && *s != '\0')
                        s++;
                    if (*s != '\0') {
                        *s = '\0';
                        s++;
                    } else
                        break;
                    selectDbid = s;
                }
            }
        }
    }
#endif  /* NISDB_LDAP_DEBUG */

    __nis_init_hash_table(&dbids, 0);

    seqNext = &ldapMappingSeq;
    for (t = tlist; t != 0; t = told) {
        int len;

#ifdef  NISDB_LDAP_DEBUG
        /*
         * If the dbId doesn't match 'selectDbid', skip this
         * mapping. Re-insert on 'tlist', in order to keep memory
         * leak checking happy. Note that 'tlist' may end up pointing
         * into the real mapping list, so it shouldn't be used once
         * this routine has been called.
         */
        if (nsdi > 0) {
            for (i = 0; i < nsdi; i++) {
                if (strcmp(sdi[i], t->dbId) == 0)
                    break;
            }
            if (i >= nsdi) {
                told = t->next;
                if (tlist != t)
                    t->next = tlist;
                else
                    t->next = 0;
                tlist = t;
                continue;
            }
        }
#endif  /* NISDB_LDAP_DEBUG */

        told = t->next;
        t->next = 0;

        /* Make sure t->item.name is set correctly */
        if (t->item.name == 0)
            t->item.name = t->dbId;

        /* Remove leading dot in object name, if any */
        len = slen(t->objName);
        while (len > 0 && t->objName[0] == '.') {
            (void) memmove(t->objName, &t->objName[1], len);
            len -= 1;
        }

        /*
         * Initialize the object path, which is what we'll
         * rehash on.
         */
        if (yp2ldap) {
            t->objPath = internal_table_name(t->objName,
                t->objPath);
            if (!t->objPath) {
                logmsg(MSG_NOTIMECHECK, LOG_ERR,
            "%s: Failed to obtain internal table name for \"%s\"",
                    myself, t->objName);
                return (-1);
            }
        } else {
            t->objPath = am(myself, len + MAXPATHLEN + 1);
            if (t->objPath == 0)
                return (-1);
            if (internal_table_name(t->objName,
                t->objPath) == 0) {
                logmsg(MSG_NOTIMECHECK, LOG_ERR,
            "%s: Failed to obtain internal table name for \"%s\"",
                    myself, t->objName);
                return (-1);
            }
        }

        /*
         * Initialize the column name array.
         */
        if (!yp2ldap) {
            if (setColumnsDuringConfig && setColumnNames(t)) {
                logmsg(MSG_NOTIMECHECK, LOG_ERR,
                "%s: Unable to find column names for \"%s\"",
                    myself, NIL(t->objName));
                return (-1);
            }
        }

        /*
         * If there are multiple mapping target containers, make
         * each one into it's own mapping structure. They can all
         * be minimal copies (i.e., share pointers to sub-structures
         * other than the objectDN).
         *
         * If objectDN is NULL, we will never use this structure.
         * In order to allow the rest of the mapping code to assume
         * objectDN != NULL, skip the mapping (even if x == t).
         */
        for (o = to = t->objectDN; o != 0; o = o->next) {
            __nis_table_mapping_t   *p;

            if (o == to) {
                x = t;
                /*
                 * Only insert the first mapping for an
                 * object on the sequential list.
                 */
                *seqNext = t;
                t->seqNext = 0;
                seqNext = (__nis_table_mapping_t **)&t->seqNext;
            } else {
                x = am(myself, sizeof (*x));
                if (x == 0) {
                    /*
                     * This happens during rpc.nisd
                     * initialization, and it's an
                     * unrecoverable disaster, so don't
                     * bother cleaning up.
                     */
                    return (-1);
                }
                memcpy(x, t, sizeof (*x));
                x->objectDN = o;
                x->next = 0;
            }

            /*
             * If x->objectDN->write.base is NULL, clone it from
             * x->objectDN->read.base.
             */
            if (x->objectDN->write.scope != LDAP_SCOPE_UNKNOWN) {
                if (x->objectDN->write.base == 0 &&
                        x->objectDN->read.base != 0) {
                    x->objectDN->write.base =
                        sdup(myself, T,
                        x->objectDN->read.base);
                    if (x->objectDN->write.base == 0)
                        return (-1);
                }
                if (x->objectDN->write.attrs == 0 &&
                        x->objectDN->read.attrs != 0) {
                    x->objectDN->write.attrs =
                        sdup(myself, T,
                        x->objectDN->read.attrs);
                    if (x->objectDN->write.attrs == 0)
                        return (-1);
                }
            }

            if (o != to) {
                /* Insert last on the 't->next' list */
                for (p = t; p->next != 0; p = p->next);
                p->next = x;
            }
        }

        /* Insert on dbid hash list */
        if (t->objectDN != 0 && !__nis_insert_item_mt(t, &dbids, 0)) {
            logmsg(MSG_NOTIMECHECK, LOG_ERR,
            "%s: Error inserting mapping for \"%s\" on hash list",
                myself, NIL(t->objName));
#ifdef  NISDB_LDAP_DEBUG
            abort();
#endif  /* NISDB_LDAP_DEBUG */
            return (-1);
        }
    }

    /*
     * dbids2objs() will remove the entries on 'dbids', so no need
     * to clean up that list from this function.
     */
    return (dbids2objs(&dbids, &ldapMappingList));
}

int
dbids2objs(__nis_hash_table_mt *dbids, __nis_hash_table_mt *objs) {
    __nis_table_mapping_t   *t, *o;
    const char      *myself = "dbids2objs";


    while ((t = __nis_pop_item_mt(dbids)) != 0) {
        /* Previous entry for this object ? */
        o = __nis_find_item_mt(t->objPath, objs, -1, 0);
        if (o != 0) {
            __nis_table_mapping_t   *p = o;
            /*
             * Mapping already exists, so this is an alternate.
             * Find the end of the list of any previous alt's,
             * and insert there.
             */
            while (p->next != 0) {
                p = p->next;
            }
            p->next = t;
            if (!__nis_release_item(o, objs, -1)) {
                logmsg(MSG_NOTIMECHECK, LOG_ERR,
                    "%s: __nis_release_item error",
                    myself);
                return (-1);
            }
        } else {
            t->item.name = t->objPath;
            if (!__nis_insert_item_mt(t, objs, 0)) {
                logmsg(MSG_NOTIMECHECK, LOG_ERR,
                    "%s: __nis_insert_item error",
                    myself);
                return (-1);
            }
        }
    }

    return (0);
}

/*
 * internal_table_name()
 *
 * Removes the local domain part from a fully qualified name
 * to create the internal table name for an object. These tables are
 * stored in /var/nis/<hostname>
 *
 * Imported from rpc.nisd/nisdb.c.
 */
char *
internal_table_name(nis_name name, char *res)
{
    char        *s, *t;
    int     i, j;

    if (yp2ldap) {
        if (name == NULL)
            return (NULL);
        res = s_strndup(name, strlen(name));
        if (res == NULL)
            return (NULL);
        return (res);
    }

    if (res == NULL)
        return (NULL);
    /* pointer at the first character of the table name */
    s = relative_name(name);

    /*
     * If s == NULL then either this is a request for a lookup
     * in our parents namespace (ILLEGAL), or we're the root
     * server and this is a lookup in our namespace.
     */
    if (s) {
        return (NULL);
    }

    t = strrchr(res, '/');
    if (t)
        t++; /* Point past the slash */
    /* Strip off the quotes if they were used here. */
    if (t[0] == '"') {
        /* Check for simply a quoted quote. */
        if (t[1] != '"') {
            j = strlen(t);
            /* shift string left by one */
            for (i = 0; i < j; i++)
                t[i] = t[i+1];
            t[j-2] = '\0'; /* Trounce trailing dquote */
        }
    }
    /*
     * OK so now we have the unique name for the table.
     * At this point we can fix it up to match local
     * file system conventions if we so desire. Since it
     * is only used in this form by _this_ server we can
     * mangle it any way we want, as long as we are consistent
     * about it. :-)
     */
    __make_legal(res);
    return (res);
}

/*
 * SYSTEM DEPENDENT
 *
 * This function makes the table name "legal" for the underlying file system.
 *
 * Imported from rpc.nisd/nisdb.c.
 */
void
__make_legal(char *s)
{
    while (*s) {
        if (isupper(*s))
            *s = tolower(*s);
        s++;
    }
}

/*
 * relative_name()
 * This internal function will remove from the NIS name, the domain
 * name of the current server, this will leave the unique part in
 * the name this becomes the "internal" version of the name. If this
 * function returns NULL then the name we were given to resolve is
 * bad somehow.
 *
 * A dynamically-allocated string is returned.
 *
 * Imported from rpc.nisd/nis_log_common.c
 */

nis_name
relative_name(s)
    char    *s; /* string with the name in it. */
{
    char            *d;
    char            *buf;
    int         dl, sl;
    name_pos        p;

    if (s == NULL)
        return (NULL);

    d = __nis_rpc_domain();
    if (d == NULL)
        return (NULL);
    dl = strlen(d);     /* _always dot terminated_   */

    buf = strdup(s);
    if (buf == NULL)
        return (NULL);
    strcpy(buf, s);     /* Make a private copy of 's'   */
    sl = strlen(buf);

    if (dl == 1) {          /* We're the '.' directory   */
        buf[sl-1] = '\0';   /* Lose the 'dot'     */
        return (buf);
    }

    p = nis_dir_cmp(buf, d);

    /* 's' is above 'd' in the tree */
    if ((p == HIGHER_NAME) || (p == NOT_SEQUENTIAL) || (p == SAME_NAME)) {
        free(buf);
        return (NULL);
    }

    /* Insert a NUL where the domain name starts in the string */
    buf[(sl - dl) - 1] = '\0';

    /* Don't return a zero length name */
    if (buf[0] == '\0') {
        free((void *)buf);
        return (NULL);
    }

    return (buf);
}

/*
 * Wrapper for internal_table_name() that allocates a large enough
 * buffer for the internal name. Return value must be freed by caller.
 * If the input 'name' is NULL, the name of the root directory table
 * is returned.
 */
char *
internalTableName(char *name) {
    char    *buf, *res;
    const char *myself = "internalTableName";

    buf = (char *)am(myself, MAXPATHLEN + NIS_MAXNAMELEN + 1);
    if (buf == 0)
        return (0);

    if (name == 0) {
        (void) memcpy(buf, ROOTDIRFILE, slen(ROOTDIRFILE));
        return (buf);
    }

    res = internal_table_name(name, buf);
    if (res != buf) {
        sfree(buf);
        buf = 0;
    }

    return (buf);
}

/*
 * Return the object mapping for the object indicated either by the
 * internal DB name ('intNameArg'; preferred), or the FQ object name
 * 'name'. If 'asObj' is non-zero, the caller is interested in the
 * object mapping proper, not a mapping of table entries. Optionally,
 * also indicate if the object is mapped from (read) or to (write) LDAP.
 *
 * Note that there may be more than one mapping of the appropriate type.
 * Use the selectTableMapping() function in ldap_map.c to get all
 * alternatives. However, the function below works as a short-cut if:
 *
 *  You only want an indication that _a_ mapping of the desired
 *  type exists, or
 *
 *  You want the non-objectDN information for an object-mapping
 *  proper (i.e., _not_ the mapping for entries in a table).
 */
__nis_table_mapping_t *
getObjMapping(char *name, char *intNameArg, int asObj,
        int *doRead, int *doWrite) {
    __nis_table_mapping_t   *t, *x;
    char            *intName;
    int         freeIntName = 0, rd, wr;

    if (doRead != 0)
        *doRead = 0;
    if (doWrite != 0)
        *doWrite = 0;

    if (intNameArg == 0) {
        if (name == 0)
            return (0);
        intName = internalTableName(name);
        if (intName == 0)
            return (0);
        freeIntName = 1;
    } else {
        intName = intNameArg;
    }

    t = __nis_find_item_mt(intName, &ldapMappingList, 0, 0);
    if (t == 0) {
        if (freeIntName)
            sfree(intName);
        return (0);
    }

    rd = wr = 0;
    for (x = t; x != 0; x = x->next) {
        /*
         * If we're looking for an object mapping, and this
         * one's for entries in a table, skip it.
         */
        if (asObj && x->objType == NIS_TABLE_OBJ &&
                x->numColumns > 0)
            continue;
        /* Check if we should read/write */
        if (x->objectDN->read.scope != LDAP_SCOPE_UNKNOWN)
            rd++;
        if (x->objectDN->write.scope != LDAP_SCOPE_UNKNOWN)
            wr++;
    }

    if (doRead != 0)
        *doRead = (rd > 0) ? 1 : 0;
    if (doWrite != 0)
        *doWrite = (wr > 0) ? 1 : 0;

    if (freeIntName)
        sfree(intName);

    return (x);
}