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/*
* $Id: acl.c 7091 2012-11-16 04:26:58Z takuya-i $
*/
#include "config.h"
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#undef PACKAGE_NAME
#undef PACKAGE_STRING
#undef PACKAGE_TARNAME
#undef PACKAGE_VERSION
#include <gfarm/gfarm.h>
#include "gfarm2fs.h"
#include "id.h"
#include "acl.h"
#include "gfarm2fs_msg_enums.h"
const char ACL_EA_ACCESS[] = "system.posix_acl_access";
const char ACL_EA_DEFAULT[] = "system.posix_acl_default";
#ifdef ENABLE_ACL /* with HAVE_SYS_ACL_H */
#include <sys/acl.h>
#define ADD_BUF(src, size) \
do { \
if (nowlen + size > bufsize) { \
/* unexpected */ \
gflog_error(GFARM_MSG_2000095, \
"unexpected acl entries size"); \
free(buf); \
return (GFARM_ERR_INVALID_ARGUMENT); \
} \
memcpy(buf + nowlen, src, size); \
nowlen += size; \
} while (0)
/* size: version=4 + (tag=2, perm=2, id=4) * num of entries */
#define ACL_BUFSIZE(acl) (4 + gfs_acl_entries(acl) * 8)
/* to get ACL */
static gfarm_error_t
gfarm2fs_gfarm_acl_to_posix_acl_xattr(
const char *url, const gfarm_acl_t acl,
void **posix_xattr_value_p, size_t *sizep)
{
gfarm_error_t e;
void *buf;
int nowlen = 0, bufsize;
gfarm_uint32_t i32;
gfarm_uint16_t i16;
gfarm_acl_tag_t tag;
gfarm_acl_perm_t perm;
uid_t uid;
gid_t gid;
gfarm_acl_entry_t ent;
gfarm_acl_permset_t pset;
char *s;
int bool;
if (acl == NULL || posix_xattr_value_p == NULL || sizep == NULL) {
gflog_debug(GFARM_MSG_2000096,
"invalid argument of "
"gfarm2fs_gfarm_acl_to_posix_acl_xattr()");
return (GFARM_ERR_INVALID_ARGUMENT);
}
bufsize = ACL_BUFSIZE(acl);
GFARM_MALLOC_ARRAY(buf, bufsize);
if (buf == NULL) {
gflog_debug(GFARM_MSG_2000097, "no memory for getting ACL");
return (GFARM_ERR_NO_MEMORY);
}
i32 = gfarm_htol_32(ACL_EA_VERSION);
ADD_BUF(&i32, sizeof(i32));
e = gfs_acl_get_entry(acl, GFARM_ACL_FIRST_ENTRY, &ent);
while (e == GFARM_ERR_NO_ERROR) {
gfs_acl_get_tag_type(ent, &tag);
/* gfarm_acl_tag to posix_acl_tag */
i16 = gfarm_htol_16((gfarm_uint16_t)tag);
ADD_BUF(&i16, sizeof(i16));
/* gfarm_acl_perm to posix_acl_perm */
perm = 0;
gfs_acl_get_permset(ent, &pset);
gfs_acl_get_perm(pset, GFARM_ACL_READ, &bool);
if (bool)
perm |= ACL_READ;
gfs_acl_get_perm(pset, GFARM_ACL_WRITE, &bool);
if (bool)
perm |= ACL_WRITE;
gfs_acl_get_perm(pset, GFARM_ACL_EXECUTE, &bool);
if (bool)
perm |= ACL_EXECUTE;
i16 = gfarm_htol_16((gfarm_uint16_t)perm);
ADD_BUF(&i16, sizeof(i16));
gfs_acl_get_qualifier(ent, &s);
if (tag == GFARM_ACL_USER) {
e = gfarm2fs_get_uid(url, s, &uid);
if (e != GFARM_ERR_NO_ERROR) {
free(buf);
return (e);
}
i32 = gfarm_htol_32((gfarm_uint32_t)uid);
} else if (tag == GFARM_ACL_GROUP) {
e = gfarm2fs_get_gid(url, s, &gid);
if (e != GFARM_ERR_NO_ERROR) {
free(buf);
return (e);
}
i32 = gfarm_htol_32((gfarm_uint32_t)gid);
} else
i32 = gfarm_htol_32((gfarm_uint32_t)ACL_UNDEFINED_ID);
ADD_BUF(&i32, sizeof(i32));
e = gfs_acl_get_entry(acl, GFARM_ACL_NEXT_ENTRY, &ent);
}
if (e == GFARM_ERR_NO_SUCH_OBJECT)
e = GFARM_ERR_NO_ERROR;
if (e != GFARM_ERR_NO_ERROR) {
free(buf);
return (e);
}
if (nowlen == 0) {
free(buf);
*posix_xattr_value_p = NULL;
*sizep = 0;
} else {
*posix_xattr_value_p = buf;
*sizep = nowlen;
}
return (GFARM_ERR_NO_ERROR);
}
/* to set ACL */
static gfarm_error_t
gfarm2fs_gfarm_acl_from_posix_acl_xattr(
const char *url, const void *posix_xattr_value,
size_t size, gfarm_acl_t *acl_p)
{
gfarm_error_t e;
gfarm_acl_t acl;
gfarm_acl_entry_t ent;
gfarm_acl_permset_t pset;
const void *p = posix_xattr_value;
const void *endp = p + size;
gfarm_uint32_t version, id;
gfarm_uint16_t tag, perm;
char *qual;
gfarm_acl_tag_t tag2;
uid_t uid;
gid_t gid;
memcpy(&version, p, sizeof(version));
p += sizeof(version);
if (p > endp)
return (GFARM_ERR_INVALID_ARGUMENT);
if (gfarm_ltoh_32(version) != ACL_EA_VERSION)
return (GFARM_ERR_INVALID_ARGUMENT);
e = gfs_acl_init(5, &acl);
if (e != GFARM_ERR_NO_ERROR)
return (e);
while (p < endp) {
memcpy(&tag, p, sizeof(tag));
p += sizeof(tag);
memcpy(&perm, p, sizeof(perm));
p += sizeof(perm);
memcpy(&id, p, sizeof(id));
p += sizeof(id);
e = gfs_acl_create_entry(&acl, &ent);
if (e != GFARM_ERR_NO_ERROR)
goto fail;
tag2 = gfarm_ltoh_16(tag);
/* posix_acl_tag to gfarm_acl_tag */
gfs_acl_set_tag_type(ent, tag2);
gfs_acl_get_permset(ent, &pset);
/* posix_acl_perm to gfarm_acl_perm */
gfs_acl_add_perm(pset, gfarm_ltoh_16(perm));
gfs_acl_set_permset(ent, pset);
switch (tag2) {
case ACL_USER_OBJ:
case ACL_GROUP_OBJ:
case ACL_MASK:
case ACL_OTHER:
qual = NULL;
gfs_acl_set_qualifier(ent, NULL);
break;
case ACL_USER:
uid = (uid_t) gfarm_ltoh_32(id);
e = gfarm2fs_get_user(url, uid, &qual);
if (e != GFARM_ERR_NO_ERROR)
goto fail;
gfs_acl_set_qualifier(ent, qual);
break;
case ACL_GROUP:
gid = (gid_t) gfarm_ltoh_32(id);
e = gfarm2fs_get_group(url, gid, &qual);
if (e != GFARM_ERR_NO_ERROR)
goto fail;
gfs_acl_set_qualifier(ent, qual);
break;
default:
e = GFARM_ERR_INVALID_ARGUMENT;
goto fail;
}
}
*acl_p = acl;
return (GFARM_ERR_NO_ERROR);
fail:
gfs_acl_free(acl);
return (e);
}
/* ------------------------------- */
gfarm_error_t
gfarm2fs_acl_set(const char *path, gfarm_acl_type_t type,
const void *value, size_t size)
{
gfarm_error_t e;
gfarm_acl_t acl;
e = gfarm2fs_gfarm_acl_from_posix_acl_xattr(path, value, size, &acl);
if (e != GFARM_ERR_NO_ERROR) {
gflog_debug(GFARM_MSG_2000098,
"gfarm2fs_gfarm_acl_from_posix_acl_xattr(%s) failed"
": %s", path, gfarm_error_string(e));
return (e);
}
gfs_acl_sort(acl);
e = gfs_acl_set_file(path, type, acl);
if (e != GFARM_ERR_NO_ERROR)
gflog_debug(GFARM_MSG_2000099,
"gfs_acl_set_file(%s) failed: %s",
path, gfarm_error_string(e));
gfs_acl_free(acl);
return (e);
}
gfarm_error_t
gfarm2fs_acl_get(const char *path, gfarm_acl_type_t type,
void *value, size_t *sizep)
{
gfarm_error_t e;
gfarm_acl_t acl;
size_t size;
void *posix;
e = gfs_acl_get_file_cached(path, type, &acl);
if (e != GFARM_ERR_NO_ERROR)
return (e);
if (*sizep == 0) {
*sizep = ACL_BUFSIZE(acl);
goto free_acl;
}
e = gfarm2fs_gfarm_acl_to_posix_acl_xattr(path, acl, &posix, &size);
if (e != GFARM_ERR_NO_ERROR) {
gflog_debug(GFARM_MSG_2000100,
"gfarm2fs_gfarm_acl_to_posix_acl_xattr() failed: %s",
gfarm_error_string(e));
goto free_acl;
}
if (size > *sizep) {
e = GFARM_ERR_RESULT_OUT_OF_RANGE;
gflog_error(GFARM_MSG_2000101,
"unexpected error: acl size > buf size");
goto free_posix;
}
if (value != NULL)
memcpy(value, posix, size);
free_posix:
*sizep = size;
free(posix);
free_acl:
gfs_acl_free(acl);
return (e);
}
#endif /* ENABLE_ACL */
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