282 lines
6.3 KiB
C
282 lines
6.3 KiB
C
/* $NetBSD: creds.c,v 1.12 2007/07/01 17:22:18 pooka Exp $ */
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/*
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* Copyright (c) 2006 Antti Kantee. All Rights Reserved.
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*
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* Development of this software was supported by the Ulla Tuominen Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if !defined(lint)
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__RCSID("$NetBSD: creds.c,v 1.12 2007/07/01 17:22:18 pooka Exp $");
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#endif /* !lint */
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/*
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* Interface for dealing with credits.
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*/
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#include <sys/types.h>
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#include <sys/param.h>
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#include <errno.h>
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#include <puffs.h>
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#include <string.h>
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#include "puffs_priv.h"
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#define UUCCRED(a) (a->pkcr_type == PUFFCRED_TYPE_UUC)
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#define INTCRED(a) (a->pkcr_type == PUFFCRED_TYPE_INTERNAL)
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int
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puffs_cred_getuid(const struct puffs_cred *pcr, uid_t *ruid)
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{
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PUFFS_MAKEKCRED(pkcr, pcr);
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if (!UUCCRED(pkcr)) {
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errno = EOPNOTSUPP;
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return -1;
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}
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*ruid = pkcr->pkcr_uuc.cr_uid;
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return 0;
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}
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int
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puffs_cred_getgid(const struct puffs_cred *pcr, gid_t *rgid)
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{
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PUFFS_MAKEKCRED(pkcr, pcr);
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if (!UUCCRED(pkcr)) {
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errno = EOPNOTSUPP;
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return -1;
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}
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*rgid = pkcr->pkcr_uuc.cr_gid;
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return 0;
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}
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int
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puffs_cred_getgroups(const struct puffs_cred *pcr, gid_t *rgids, short *ngids)
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{
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PUFFS_MAKEKCRED(pkcr, pcr);
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size_t ncopy;
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if (!UUCCRED(pkcr)) {
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errno = EOPNOTSUPP;
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return -1;
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}
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ncopy = MIN(*ngids, NGROUPS);
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(void)memcpy(rgids, pkcr->pkcr_uuc.cr_groups, sizeof(gid_t) * ncopy);
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*ngids = (short)ncopy;
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return 0;
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}
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int
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puffs_cred_isuid(const struct puffs_cred *pcr, uid_t uid)
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{
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PUFFS_MAKEKCRED(pkcr, pcr);
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return UUCCRED(pkcr) && pkcr->pkcr_uuc.cr_uid == uid;
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}
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int
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puffs_cred_hasgroup(const struct puffs_cred *pcr, gid_t gid)
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{
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PUFFS_MAKEKCRED(pkcr, pcr);
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short i;
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if (!UUCCRED(pkcr))
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return 0;
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if (pkcr->pkcr_uuc.cr_gid == gid)
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return 1;
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for (i = 0; i < pkcr->pkcr_uuc.cr_ngroups; i++)
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if (pkcr->pkcr_uuc.cr_groups[i] == gid)
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return 1;
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return 0;
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}
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int
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puffs_cred_isregular(const struct puffs_cred *pcr)
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{
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PUFFS_MAKEKCRED(pkcr, pcr);
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return UUCCRED(pkcr);
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}
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int
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puffs_cred_iskernel(const struct puffs_cred *pcr)
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{
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PUFFS_MAKEKCRED(pkcr, pcr);
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return INTCRED(pkcr) && pkcr->pkcr_internal == PUFFCRED_CRED_NOCRED;
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}
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int
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puffs_cred_isfs(const struct puffs_cred *pcr)
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{
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PUFFS_MAKEKCRED(pkcr, pcr);
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return INTCRED(pkcr) && pkcr->pkcr_internal == PUFFCRED_CRED_FSCRED;
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}
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int
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puffs_cred_isjuggernaut(const struct puffs_cred *pcr)
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{
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return puffs_cred_isuid(pcr, 0) || puffs_cred_iskernel(pcr)
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|| puffs_cred_isfs(pcr);
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}
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int
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puffs_cid_getpid(const struct puffs_cid *pcid, pid_t *pid)
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{
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PUFFS_MAKEKCID(pkcid, pcid);
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if (pkcid->pkcid_type == PUFFCID_TYPE_REAL) {
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*pid = pkcid->pkcid_pid;
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return 0;
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} else
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return ESRCH;
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}
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int
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puffs_cid_getlwpid(const struct puffs_cid *pcid, lwpid_t *lid)
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{
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PUFFS_MAKEKCID(pkcid, pcid);
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if (pkcid->pkcid_type == PUFFCID_TYPE_REAL) {
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*lid = pkcid->pkcid_lwpid;
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return 0;
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} else
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return ESRCH;
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}
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/*
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* Gerneic routine for checking file access rights. Modeled after
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* vaccess() in the kernel.
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*/
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int
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puffs_access(enum vtype type, mode_t file_mode, uid_t uid, gid_t gid,
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mode_t acc_mode, const struct puffs_cred *pcr)
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{
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mode_t mask;
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/* megapower */
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if (puffs_cred_iskernel(pcr) || puffs_cred_isfs(pcr))
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return 0;
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/* superuser, allow all except exec if *ALL* exec bits are unset */
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if (puffs_cred_isuid(pcr, 0)) {
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if ((acc_mode & PUFFS_VEXEC) && type != VDIR &&
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(file_mode & (S_IXUSR|S_IXGRP|S_IXOTH)) == 0)
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return EACCES;
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return 0;
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}
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mask = 0;
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/* owner */
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if (puffs_cred_isuid(pcr, uid)) {
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if (acc_mode & PUFFS_VEXEC)
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mask |= S_IXUSR;
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if (acc_mode & PUFFS_VREAD)
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mask |= S_IRUSR;
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if (acc_mode & PUFFS_VWRITE)
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mask |= S_IWUSR;
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/* group */
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} else if (puffs_cred_hasgroup(pcr, gid)) {
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if (acc_mode & PUFFS_VEXEC)
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mask |= S_IXGRP;
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if (acc_mode & PUFFS_VREAD)
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mask |= S_IRGRP;
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if (acc_mode & PUFFS_VWRITE)
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mask |= S_IWGRP;
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/* other */
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} else {
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if (acc_mode & PUFFS_VEXEC)
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mask |= S_IXOTH;
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if (acc_mode & PUFFS_VREAD)
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mask |= S_IROTH;
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if (acc_mode & PUFFS_VWRITE)
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mask |= S_IWOTH;
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}
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if ((file_mode & mask) == mask)
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return 0;
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else
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return EACCES;
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}
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int
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puffs_access_chown(uid_t owner, gid_t group, uid_t newowner, gid_t newgroup,
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const struct puffs_cred *pcr)
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{
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if (newowner == (uid_t)PUFFS_VNOVAL)
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newowner = owner;
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if (newgroup == (gid_t)PUFFS_VNOVAL)
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newgroup = group;
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if ((!puffs_cred_isuid(pcr, owner) || newowner != owner ||
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((newgroup != group && !puffs_cred_hasgroup(pcr, newgroup))))
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&& !puffs_cred_isjuggernaut(pcr))
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return EPERM;
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return 0;
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}
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int
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puffs_access_chmod(uid_t owner, gid_t group, enum vtype type, mode_t mode,
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const struct puffs_cred *pcr)
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{
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if (!puffs_cred_isuid(pcr, owner) && !puffs_cred_isjuggernaut(pcr))
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return EPERM;
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if (!puffs_cred_isjuggernaut(pcr)) {
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if (type != VDIR && (mode & S_ISTXT))
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return EFTYPE;
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if (!puffs_cred_hasgroup(pcr, group) && (mode & S_ISGID))
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return EPERM;
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}
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return 0;
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}
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int
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puffs_access_times(uid_t uid, gid_t gid, mode_t mode, int va_utimes_null,
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const struct puffs_cred *pcr)
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{
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if (!puffs_cred_isuid(pcr, uid) && !puffs_cred_isjuggernaut(pcr)
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&& (va_utimes_null == 0
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|| puffs_access(VNON, mode, uid, gid, PUFFS_VWRITE, pcr) != 0))
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return EPERM;
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return 0;
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}
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