libproject/common/getprojent.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) 1999, 2011, Oracle and/or its affiliates. All rights reserved.
 */


#include <sys/types.h>
#include <user_attr.h>
#include <pwd.h>
#include <grp.h>
#include <userdefs.h>
#include <project.h>
#include <memory.h>
#include <nss_dbdefs.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/param.h>
#include <sys/mman.h>

#pragma weak setprojent = _setprojent
#pragma weak endprojent = _endprojent
#pragma weak getprojent = _getprojent
#pragma weak fgetprojent = _fgetprojent
#pragma weak getprojbyid = _getprojbyid
#pragma weak getprojbyname = _getprojbyname
#pragma weak getdefaultproj = _getdefaultproj
#pragma weak inproj = _inproj
#pragma weak getprojidbyname = _getprojidbyname

#define DEFAULT_PROJECT 1
#define NORMAL_PROJECT  0

static int ismember(struct project *, const char *, gid_t, int);
int _str2project(const char *, int, void *, char *, int);

static DEFINE_NSS_DB_ROOT(db_root);
static DEFINE_NSS_GETENT(context);

void
_nss_initf_project(nss_db_params_t *p)
{
    p->name = NSS_DBNAM_PROJECT;
    p->default_config = NSS_DEFCONF_PROJECT;
}

void
_setprojent(void)
{
    nss_setent(&db_root, _nss_initf_project, &context);
}

void
_endprojent(void)
{
    nss_endent(&db_root, _nss_initf_project, &context);
    nss_delete(&db_root);
}

struct project *
_getprojent(struct project *result, void *buffer, size_t buflen)
{
    nss_XbyY_args_t arg;

    NSS_XbyY_INIT(&arg, result, buffer, buflen, _str2project);
    (void) nss_getent(&db_root, _nss_initf_project, &context, &arg);
    return ((struct project *)NSS_XbyY_FINI(&arg));
}

struct project *
_fgetprojent(FILE *f, struct project *result, void *buffer, size_t buflen)
{
    extern void _nss_XbyY_fgets(FILE *, nss_XbyY_args_t *);
    nss_XbyY_args_t arg;

    NSS_XbyY_INIT(&arg, result, buffer, buflen, _str2project);
    _nss_XbyY_fgets(f, &arg);
    return ((struct project *)NSS_XbyY_FINI(&arg));
}

struct project *
_getprojbyid(projid_t projid, struct project *result,
    void *buffer, size_t buflen)
{
    nss_XbyY_args_t arg;

    NSS_XbyY_INIT(&arg, result, buffer, buflen, _str2project);
    arg.key.projid = projid;
    (void) nss_search(&db_root, _nss_initf_project,
        NSS_DBOP_PROJECT_BYID, &arg);
    return ((struct project *)NSS_XbyY_FINI(&arg));
}

struct project *
_getprojbyname(const char *name, struct project *result,
    void *buffer, size_t buflen)
{
    nss_XbyY_args_t arg;
    NSS_XbyY_INIT(&arg, result, buffer, buflen, _str2project);
    arg.key.name = name;
    (void) nss_search(&db_root, _nss_initf_project,
        NSS_DBOP_PROJECT_BYNAME, &arg);
    return ((struct project *)NSS_XbyY_FINI(&arg));
}

/*
 * The following routine checks if user specified by the second argument
 * is allowed to join the project specified as project structure in first
 * argument.  Information about user's default group and whether or not
 * the project specified in the first argument is user's default project
 * (i.e., user_attr, "default", "user.username", or "group.groupname"
 * should also be provided.  If is_default is set to DEFAULT_PROJECT,
 * then this function returns 1 (true), unless specified user explicitly
 * excluded with "!user", or "!group" wildcards.
 */
static int
ismember(struct project *proj, const char *user, gid_t gid, int is_default)
{
    char grbuf[NSS_BUFLEN_GROUP];
    char groupname[MAXGLEN + 1];
    int res = is_default;
    struct group grp;
    int group_ok = 0;
    char **u, **g;
    char *member;

    if (getgrgid_r(gid, &grp, grbuf, NSS_BUFLEN_GROUP) != NULL) {
        group_ok = 1;
        (void) snprintf(groupname, MAXGLEN, grp.gr_name);
    }

    /*
     * Scan project's user list.
     */
    for (u = proj->pj_users; *u; u++) {
        member = *u;
        if (member[0] == '!' &&
            (strcmp(member + 1, user) == 0 ||
            strcmp(member + 1, "*") == 0))
            return (0);
        if (strcmp(member, "*") == 0 || strcmp(member, user) == 0)
            res = 1;
    }

    /*
     * Scan project's group list.
     */
    for (g = proj->pj_groups; *g; g++) {
        member = *g;
        /*
         * Check if user's default group is included here.
         */
        if (group_ok) {
            if (member[0] == '!' &&
                (strcmp(member + 1, groupname) == 0 ||
                strcmp(member + 1, "*") == 0))
                return (0);
            if (strcmp(member, "*") == 0 ||
                strcmp(member, groupname) == 0)
                res = 1;
        }
        /*
         * Check if user is a member of one of project's groups.
         */
        if (getgrnam_r(member, &grp, grbuf, NSS_BUFLEN_GROUP) != NULL) {
            for (u = grp.gr_mem; *u; u++)
                if (strcmp(*u, user) == 0)
                    res = 1;
        }
    }
    return (res);
}

struct project *
_getdefaultproj(const char *user, struct project *result,
    void *buffer, size_t buflen)
{
    char projname[PROJNAME_MAX + 1];
    nss_XbyY_args_t arg;
    userattr_t *uattr;
    struct passwd p;
    struct group g;
    char *attrproj;

    NSS_XbyY_INIT(&arg, result, buffer, buflen, _str2project);

    /*
     * Need user's default group ID for ismember() calls later
     */
    if (getpwnam_r(user, &p, buffer, buflen) == NULL)
        return (NULL);

    /*
     * Check user_attr database first
     */
    if ((uattr = getusernam(user)) != NULL) {
        if ((attrproj = kva_match(uattr->attr, "project")) != NULL) {
            arg.key.name = attrproj;
            (void) nss_search(&db_root, _nss_initf_project,
                NSS_DBOP_PROJECT_BYNAME, &arg);
            if ((result = NSS_XbyY_FINI(&arg)) != NULL) {
                free_userattr(uattr);
                return (result);
            }
        }
        free_userattr(uattr);
    }

    /*
     * Check user.{username} and group.{groupname} projects
     */
    (void) snprintf(projname, PROJNAME_MAX, "user.%s", user);
    arg.key.name = projname;
    (void) nss_search(&db_root, _nss_initf_project,
        NSS_DBOP_PROJECT_BYNAME, &arg);
    if ((result = NSS_XbyY_FINI(&arg)) != NULL &&
        ismember(result, user, p.pw_gid, DEFAULT_PROJECT))
        return (result);
    if (getgrgid_r(p.pw_gid, &g, buffer, buflen) != NULL) {
        (void) snprintf(projname, PROJNAME_MAX, "group.%s", g.gr_name);
        arg.key.name = projname;
        (void) nss_search(&db_root, _nss_initf_project,
            NSS_DBOP_PROJECT_BYNAME, &arg);
        if ((result = NSS_XbyY_FINI(&arg)) != NULL &&
            ismember(result, user, p.pw_gid, DEFAULT_PROJECT))
            return (result);
    }
    arg.key.name = "default";
    (void) nss_search(&db_root, _nss_initf_project,
        NSS_DBOP_PROJECT_BYNAME, &arg);
    if ((result = NSS_XbyY_FINI(&arg)) != NULL &&
        ismember(result, user, p.pw_gid, DEFAULT_PROJECT))
        return (result);
    return (NULL);
}

int
_inproj(const char *user, const char *name, void *buffer, size_t buflen)
{
    char projname[PROJNAME_MAX + 1];
    char grbuf[NSS_BUFLEN_GROUP];
    nss_XbyY_args_t arg;
    struct project proj;
    struct passwd pwd;
    userattr_t *uattr;
    struct group grp;
    char *attrproj;
    gid_t gid;

    NSS_XbyY_INIT(&arg, &proj, buffer, buflen, _str2project);

    /*
     * 0. Sanity checks.
     */
    if (getpwnam_r(user, &pwd, buffer, buflen) == NULL)
        return (0);     /* user does not exist */
    gid = pwd.pw_gid;
    if (getprojbyname(name, &proj, buffer, buflen) == NULL)
        return (0);     /* project does not exist */

    /*
     * 1. Check for special "default" project.
     */
    if (strcmp("default", name) == 0)
        return (ismember(&proj, user, gid, DEFAULT_PROJECT));

    /*
     * 2. Check user_attr database.
     */
    if ((uattr = getusernam(user)) != NULL) {
        if ((attrproj = kva_match(uattr->attr, "project")) != NULL) {
            if (strcmp(attrproj, name) == 0) {
                free_userattr(uattr);
                return (ismember(&proj, user, gid,
                    DEFAULT_PROJECT));
            }
        }
        free_userattr(uattr);
    }

    /*
     * 3. Check if this is a special "user.username" project.
     *
     * User "username" is considered to be a member of project
     * "user.username" even if project's user lists do not
     * include "username".
     */
    (void) snprintf(projname, PROJNAME_MAX, "user.%s", user);
    if (strcmp(projname, name) == 0)
        return (ismember(&proj, user, gid, DEFAULT_PROJECT));

    /*
     * 4. Check if this is a special "group.groupname" project.
     *
     * User "username" with default group "groupname" is considered
     * to be a member of project "group.groupname" even if project's
     * group list does not include "groupname".
     */
    if (getgrgid_r(gid, &grp, grbuf, NSS_LINELEN_GROUP) != NULL) {
        (void) snprintf(projname, PROJNAME_MAX,
            "group.%s", grp.gr_name);
        if (strcmp(projname, name) == 0)
            return (ismember(&proj, user, gid, DEFAULT_PROJECT));
    }

    /*
     * 5. Handle all other (non-default) projects.
     */
    return (ismember(&proj, user, gid, NORMAL_PROJECT));
}

/*
 * Just a quick wrapper around getprojbyname so that the caller does not
 * need to allocate the buffer.
 */
projid_t
_getprojidbyname(const char *name)
{
    struct project proj;
    char buf[PROJECT_BUFSZ];

    if (getprojbyname(name, &proj, &buf, PROJECT_BUFSZ) != NULL)
        return (proj.pj_projid);
    else
        return ((projid_t)-1);
}

static char *
gettok(char **nextpp, char sep)
{
    char *p = *nextpp;
    char *q = p;
    char c;

    if (p == NULL)
        return (NULL);
    while ((c = *q) != '\0' && c != sep)
        q++;
    if (c == '\0')
        *nextpp = 0;
    else {
        *q++ = '\0';
        *nextpp = q;
    }
    return (p);
}


/*
 * Return values: 0 = success, 1 = parse error, 2 = erange ...
 * The structure pointer passed in is a structure in the caller's space
 * wherein the field pointers would be set to areas in the buffer if
 * need be. instring and buffer should be separate areas.
 */
int
_str2project(const char *instr, int lenstr, void *ent, char *buffer, int buflen)
{
    struct project *project = ent;
    char *p, *next;
    char *users, *groups;
    char **uglist;
    char **limit;

    if (lenstr + 1 > buflen)
        return (NSS_STR_PARSE_ERANGE);
    /*
     * We copy the input string into the output buffer and
     * operate on it in place.
     */
    (void) memcpy(buffer, instr, lenstr);
    buffer[lenstr] = '\0';
    next = buffer;

    limit = (char **)ROUND_DOWN(buffer + buflen, sizeof (char *));

    /*
     * Parsers for passwd and group have always been pretty rigid;
     * we wouldn't want to buck a Unix tradition
     */
    p = gettok(&next, ':');
    if (p == NULL || *p == '\0' || strlen(p) > PROJNAME_MAX) {
        /*
         * empty or very long project names are not allowed
         */
        return (NSS_STR_PARSE_ERANGE);
    }
    project->pj_name = p;

    p = gettok(&next, ':');
    if (p == NULL || *p == '\0') {
        /*
         * projid field shouldn't be empty
         */
        return (NSS_STR_PARSE_PARSE);
    }
    project->pj_projid = (projid_t)strtol(p, NULL, 10);
    if (project->pj_projid < 0) {
        /*
         * projids should be positive number
         */
        project->pj_projid = 0;
        return (NSS_STR_PARSE_PARSE);
    }

    p = gettok(&next, ':');
    if (p == NULL) {
        /*
         * comment field can be empty but should not be last field
         */
        return (NSS_STR_PARSE_PARSE);
    }
    project->pj_comment = p;

    if ((users = gettok(&next, ':')) == NULL) {
        /*
         * users field should not be last field
         */
        return (NSS_STR_PARSE_PARSE);
    }

    if ((groups = gettok(&next, ':')) == NULL) {
        /*
         * groups field should not be last field
         */
        return (NSS_STR_PARSE_PARSE);
    }

    if (next == NULL) {
        /*
         * attributes field should be last
         */
        return (NSS_STR_PARSE_PARSE);
    }

    project->pj_attr = next;

    uglist = (char **)ROUND_UP(buffer + lenstr + 1, sizeof (char *));
    *uglist = NULL;
    project->pj_users = uglist;
    while (uglist < limit) {
        p = gettok(&users, ',');
        if (p == NULL || *p == '\0') {
            *uglist = 0;
            break;
        }
        *uglist++ = p;
    }
    if (uglist >= limit)
        return (NSS_STR_PARSE_ERANGE);

    uglist++;
    *uglist = NULL;
    project->pj_groups = uglist;
    while (uglist < limit) {
        p = gettok(&groups, ',');
        if (p == NULL || *p == '\0') {
            *uglist = 0;
            break;
        }
        *uglist++ = p;
    }
    if (uglist >= limit)
        return (NSS_STR_PARSE_ERANGE);

    return (NSS_STR_PARSE_SUCCESS);
}