[thirdparty/systemd.git] / src / shared / acl-util.c

/* SPDX-License-Identifier: LGPL-2.1+ */

#include <errno.h>
#include <stdbool.h>
#include <sys/stat.h>
#include <sys/types.h>

#include "acl-util.h"
#include "alloc-util.h"
#include "string-util.h"
#include "strv.h"
#include "user-util.h"
#include "util.h"

int acl_find_uid(acl_t acl, uid_t uid, acl_entry_t *entry) {
        acl_entry_t i;
        int r;

        assert(acl);
        assert(entry);

        for (r = acl_get_entry(acl, ACL_FIRST_ENTRY, &i);
             r > 0;
             r = acl_get_entry(acl, ACL_NEXT_ENTRY, &i)) {

                acl_tag_t tag;
                uid_t *u;
                bool b;

                if (acl_get_tag_type(i, &tag) < 0)
                        return -errno;

                if (tag != ACL_USER)
                        continue;

                u = acl_get_qualifier(i);
                if (!u)
                        return -errno;

                b = *u == uid;
                acl_free(u);

                if (b) {
                        *entry = i;
                        return 1;
                }
        }
        if (r < 0)
                return -errno;

        return 0;
}

int calc_acl_mask_if_needed(acl_t *acl_p) {
        acl_entry_t i;
        int r;
        bool need = false;

        assert(acl_p);

        for (r = acl_get_entry(*acl_p, ACL_FIRST_ENTRY, &i);
             r > 0;
             r = acl_get_entry(*acl_p, ACL_NEXT_ENTRY, &i)) {
                acl_tag_t tag;

                if (acl_get_tag_type(i, &tag) < 0)
                        return -errno;

                if (tag == ACL_MASK)
                        return 0;

                if (IN_SET(tag, ACL_USER, ACL_GROUP))
                        need = true;
        }
        if (r < 0)
                return -errno;

        if (need && acl_calc_mask(acl_p) < 0)
                return -errno;

        return need;
}

int add_base_acls_if_needed(acl_t *acl_p, const char *path) {
        acl_entry_t i;
        int r;
        bool have_user_obj = false, have_group_obj = false, have_other = false;
        struct stat st;
        _cleanup_(acl_freep) acl_t basic = NULL;

        assert(acl_p);

        for (r = acl_get_entry(*acl_p, ACL_FIRST_ENTRY, &i);
             r > 0;
             r = acl_get_entry(*acl_p, ACL_NEXT_ENTRY, &i)) {
                acl_tag_t tag;

                if (acl_get_tag_type(i, &tag) < 0)
                        return -errno;

                if (tag == ACL_USER_OBJ)
                        have_user_obj = true;
                else if (tag == ACL_GROUP_OBJ)
                        have_group_obj = true;
                else if (tag == ACL_OTHER)
                        have_other = true;
                if (have_user_obj && have_group_obj && have_other)
                        return 0;
        }
        if (r < 0)
                return -errno;

        r = stat(path, &st);
        if (r < 0)
                return -errno;

        basic = acl_from_mode(st.st_mode);
        if (!basic)
                return -errno;

        for (r = acl_get_entry(basic, ACL_FIRST_ENTRY, &i);
             r > 0;
             r = acl_get_entry(basic, ACL_NEXT_ENTRY, &i)) {
                acl_tag_t tag;
                acl_entry_t dst;

                if (acl_get_tag_type(i, &tag) < 0)
                        return -errno;

                if ((tag == ACL_USER_OBJ && have_user_obj) ||
                    (tag == ACL_GROUP_OBJ && have_group_obj) ||
                    (tag == ACL_OTHER && have_other))
                        continue;

                r = acl_create_entry(acl_p, &dst);
                if (r < 0)
                        return -errno;

                r = acl_copy_entry(dst, i);
                if (r < 0)
                        return -errno;
        }
        if (r < 0)
                return -errno;
        return 0;
}

int acl_search_groups(const char *path, char ***ret_groups) {
        _cleanup_strv_free_ char **g = NULL;
        _cleanup_(acl_freep) acl_t acl = NULL;
        bool ret = false;
        acl_entry_t entry;
        int r;

        assert(path);

        acl = acl_get_file(path, ACL_TYPE_DEFAULT);
        if (!acl)
                return -errno;

        r = acl_get_entry(acl, ACL_FIRST_ENTRY, &entry);
        for (;;) {
                _cleanup_(acl_free_gid_tpp) gid_t *gid = NULL;
                acl_tag_t tag;

                if (r < 0)
                        return -errno;
                if (r == 0)
                        break;

                if (acl_get_tag_type(entry, &tag) < 0)
                        return -errno;

                if (tag != ACL_GROUP)
                        goto next;

                gid = acl_get_qualifier(entry);
                if (!gid)
                        return -errno;

                if (in_gid(*gid) > 0) {
                        if (!ret_groups)
                                return true;

                        ret = true;
                }

                if (ret_groups) {
                        char *name;

                        name = gid_to_name(*gid);
                        if (!name)
                                return -ENOMEM;

                        r = strv_consume(&g, name);
                        if (r < 0)
                                return r;
                }

        next:
                r = acl_get_entry(acl, ACL_NEXT_ENTRY, &entry);
        }

        if (ret_groups)
                *ret_groups = TAKE_PTR(g);

        return ret;
}

int parse_acl(const char *text, acl_t *acl_access, acl_t *acl_default, bool want_mask) {
        _cleanup_free_ char **a = NULL, **d = NULL; /* strings are not freed */
        _cleanup_strv_free_ char **split;
        char **entry;
        int r = -EINVAL;
        _cleanup_(acl_freep) acl_t a_acl = NULL, d_acl = NULL;

        split = strv_split(text, ",");
        if (!split)
                return -ENOMEM;

        STRV_FOREACH(entry, split) {
                char *p;

                p = STARTSWITH_SET(*entry, "default:", "d:");
                if (p)
                        r = strv_push(&d, p);
                else
                        r = strv_push(&a, *entry);
                if (r < 0)
                        return r;
        }

        if (!strv_isempty(a)) {
                _cleanup_free_ char *join;

                join = strv_join(a, ",");
                if (!join)
                        return -ENOMEM;

                a_acl = acl_from_text(join);
                if (!a_acl)
                        return -errno;

                if (want_mask) {
                        r = calc_acl_mask_if_needed(&a_acl);
                        if (r < 0)
                                return r;
                }
        }

        if (!strv_isempty(d)) {
                _cleanup_free_ char *join;

                join = strv_join(d, ",");
                if (!join)
                        return -ENOMEM;

                d_acl = acl_from_text(join);
                if (!d_acl)
                        return -errno;

                if (want_mask) {
                        r = calc_acl_mask_if_needed(&d_acl);
                        if (r < 0)
                                return r;
                }
        }

        *acl_access = TAKE_PTR(a_acl);
        *acl_default = TAKE_PTR(d_acl);

        return 0;
}

static int acl_entry_equal(acl_entry_t a, acl_entry_t b) {
        acl_tag_t tag_a, tag_b;

        if (acl_get_tag_type(a, &tag_a) < 0)
                return -errno;

        if (acl_get_tag_type(b, &tag_b) < 0)
                return -errno;

        if (tag_a != tag_b)
                return false;

        switch (tag_a) {
        case ACL_USER_OBJ:
        case ACL_GROUP_OBJ:
        case ACL_MASK:
        case ACL_OTHER:
                /* can have only one of those */
                return true;
        case ACL_USER: {
                _cleanup_(acl_free_uid_tpp) uid_t *uid_a = NULL, *uid_b = NULL;

                uid_a = acl_get_qualifier(a);
                if (!uid_a)
                        return -errno;

                uid_b = acl_get_qualifier(b);
                if (!uid_b)
                        return -errno;

                return *uid_a == *uid_b;
        }
        case ACL_GROUP: {
                _cleanup_(acl_free_gid_tpp) gid_t *gid_a = NULL, *gid_b = NULL;

                gid_a = acl_get_qualifier(a);
                if (!gid_a)
                        return -errno;

                gid_b = acl_get_qualifier(b);
                if (!gid_b)
                        return -errno;

                return *gid_a == *gid_b;
        }
        default:
                assert_not_reached("Unknown acl tag type");
        }
}

static int find_acl_entry(acl_t acl, acl_entry_t entry, acl_entry_t *out) {
        acl_entry_t i;
        int r;

        for (r = acl_get_entry(acl, ACL_FIRST_ENTRY, &i);
             r > 0;
             r = acl_get_entry(acl, ACL_NEXT_ENTRY, &i)) {

                r = acl_entry_equal(i, entry);
                if (r < 0)
                        return r;
                if (r > 0) {
                        *out = i;
                        return 1;
                }
        }
        if (r < 0)
                return -errno;
        return 0;
}

int acls_for_file(const char *path, acl_type_t type, acl_t new, acl_t *acl) {
        _cleanup_(acl_freep) acl_t old;
        acl_entry_t i;
        int r;

        old = acl_get_file(path, type);
        if (!old)
                return -errno;

        for (r = acl_get_entry(new, ACL_FIRST_ENTRY, &i);
             r > 0;
             r = acl_get_entry(new, ACL_NEXT_ENTRY, &i)) {

                acl_entry_t j;

                r = find_acl_entry(old, i, &j);
                if (r < 0)
                        return r;
                if (r == 0)
                        if (acl_create_entry(&old, &j) < 0)
                                return -errno;

                if (acl_copy_entry(j, i) < 0)
                        return -errno;
        }
        if (r < 0)
                return -errno;

        *acl = TAKE_PTR(old);

        return 0;
}

int add_acls_for_user(int fd, uid_t uid) {
        _cleanup_(acl_freep) acl_t acl = NULL;
        acl_entry_t entry;
        acl_permset_t permset;
        int r;

        acl = acl_get_fd(fd);
        if (!acl)
                return -errno;

        r = acl_find_uid(acl, uid, &entry);
        if (r <= 0) {
                if (acl_create_entry(&acl, &entry) < 0 ||
                    acl_set_tag_type(entry, ACL_USER) < 0 ||
                    acl_set_qualifier(entry, &uid) < 0)
                        return -errno;
        }

        /* We do not recalculate the mask unconditionally here,
         * so that the fchmod() mask above stays intact. */
        if (acl_get_permset(entry, &permset) < 0 ||
            acl_add_perm(permset, ACL_READ) < 0)
                return -errno;

        r = calc_acl_mask_if_needed(&acl);
        if (r < 0)
                return r;

        return acl_set_fd(fd, acl);
}
Commit	Line	Data
53e1b683	1	/* SPDX-License-Identifier: LGPL-2.1+ */
f4b47811	2
f4b47811 LP	3	#include <errno.h>
f4b47811 LP	4	#include <stdbool.h>
ca78ad1d ZJS	5	#include <sys/stat.h>
ca78ad1d ZJS	6	#include <sys/types.h>
f4b47811	7
b1d4f8e1	8	#include "acl-util.h"
cf0fbc49	9	#include "alloc-util.h"
07630cea	10	#include "string-util.h"
478c8269	11	#include "strv.h"
b1d4f8e1	12	#include "user-util.h"
07630cea	13	#include "util.h"
f4b47811 LP	14
	15	int acl_find_uid(acl_t acl, uid_t uid, acl_entry_t *entry) {
	16	acl_entry_t i;
dd4105b0	17	int r;
f4b47811 LP	18
	19	assert(acl);
	20	assert(entry);
	21
dd4105b0 ZJS	22	for (r = acl_get_entry(acl, ACL_FIRST_ENTRY, &i);
	23	r > 0;
	24	r = acl_get_entry(acl, ACL_NEXT_ENTRY, &i)) {
f4b47811 LP	25
	26	acl_tag_t tag;
	27	uid_t *u;
	28	bool b;
	29
	30	if (acl_get_tag_type(i, &tag) < 0)
	31	return -errno;
	32
	33	if (tag != ACL_USER)
	34	continue;
	35
	36	u = acl_get_qualifier(i);
	37	if (!u)
	38	return -errno;
	39
	40	b = *u == uid;
	41	acl_free(u);
	42
	43	if (b) {
	44	*entry = i;
	45	return 1;
	46	}
	47	}
dd4105b0	48	if (r < 0)
f4b47811 LP	49	return -errno;
	50
	51	return 0;
	52	}
478c8269	53
23ad4dd8 JAS	54	int calc_acl_mask_if_needed(acl_t *acl_p) {
23ad4dd8 JAS	55	acl_entry_t i;
dd4105b0	56	int r;
6debb398	57	bool need = false;
23ad4dd8 JAS	58
	59	assert(acl_p);
	60
dd4105b0 ZJS	61	for (r = acl_get_entry(*acl_p, ACL_FIRST_ENTRY, &i);
	62	r > 0;
	63	r = acl_get_entry(*acl_p, ACL_NEXT_ENTRY, &i)) {
23ad4dd8 JAS	64	acl_tag_t tag;
	65
	66	if (acl_get_tag_type(i, &tag) < 0)
	67	return -errno;
	68
	69	if (tag == ACL_MASK)
	70	return 0;
e346512c	71
6debb398 ZJS	72	if (IN_SET(tag, ACL_USER, ACL_GROUP))
6debb398 ZJS	73	need = true;
23ad4dd8	74	}
dd4105b0	75	if (r < 0)
23ad4dd8 JAS	76	return -errno;
23ad4dd8 JAS	77
6debb398 ZJS	78	if (need && acl_calc_mask(acl_p) < 0)
	79	return -errno;
	80
	81	return need;
dd4105b0 ZJS	82	}
	83
	84	int add_base_acls_if_needed(acl_t acl_p, const char path) {
	85	acl_entry_t i;
	86	int r;
	87	bool have_user_obj = false, have_group_obj = false, have_other = false;
	88	struct stat st;
	89	_cleanup_(acl_freep) acl_t basic = NULL;
	90
	91	assert(acl_p);
	92
	93	for (r = acl_get_entry(*acl_p, ACL_FIRST_ENTRY, &i);
	94	r > 0;
	95	r = acl_get_entry(*acl_p, ACL_NEXT_ENTRY, &i)) {
	96	acl_tag_t tag;
	97
	98	if (acl_get_tag_type(i, &tag) < 0)
	99	return -errno;
	100
	101	if (tag == ACL_USER_OBJ)
	102	have_user_obj = true;
	103	else if (tag == ACL_GROUP_OBJ)
	104	have_group_obj = true;
	105	else if (tag == ACL_OTHER)
	106	have_other = true;
	107	if (have_user_obj && have_group_obj && have_other)
	108	return 0;
	109	}
	110	if (r < 0)
	111	return -errno;
23ad4dd8	112
dd4105b0 ZJS	113	r = stat(path, &st);
	114	if (r < 0)
	115	return -errno;
	116
	117	basic = acl_from_mode(st.st_mode);
	118	if (!basic)
	119	return -errno;
	120
	121	for (r = acl_get_entry(basic, ACL_FIRST_ENTRY, &i);
	122	r > 0;
	123	r = acl_get_entry(basic, ACL_NEXT_ENTRY, &i)) {
	124	acl_tag_t tag;
	125	acl_entry_t dst;
	126
	127	if (acl_get_tag_type(i, &tag) < 0)
	128	return -errno;
	129
	130	if ((tag == ACL_USER_OBJ && have_user_obj) \|\|
	131	(tag == ACL_GROUP_OBJ && have_group_obj) \|\|
	132	(tag == ACL_OTHER && have_other))
	133	continue;
	134
	135	r = acl_create_entry(acl_p, &dst);
	136	if (r < 0)
	137	return -errno;
	138
	139	r = acl_copy_entry(dst, i);
	140	if (r < 0)
	141	return -errno;
	142	}
	143	if (r < 0)
	144	return -errno;
23ad4dd8 JAS	145	return 0;
	146	}
	147
e346512c LP	148	int acl_search_groups(const char path, char **ret_groups) {
e346512c LP	149	_cleanup_strv_free_ char **g = NULL;
29d87223	150	_cleanup_(acl_freep) acl_t acl = NULL;
e346512c LP	151	bool ret = false;
	152	acl_entry_t entry;
	153	int r;
478c8269 ZJS	154
478c8269 ZJS	155	assert(path);
478c8269 ZJS	156
478c8269 ZJS	157	acl = acl_get_file(path, ACL_TYPE_DEFAULT);
e346512c LP	158	if (!acl)
e346512c LP	159	return -errno;
478c8269	160
e346512c LP	161	r = acl_get_entry(acl, ACL_FIRST_ENTRY, &entry);
	162	for (;;) {
	163	_cleanup_(acl_free_gid_tpp) gid_t *gid = NULL;
	164	acl_tag_t tag;
478c8269	165
e346512c LP	166	if (r < 0)
	167	return -errno;
	168	if (r == 0)
	169	break;
478c8269	170
e346512c LP	171	if (acl_get_tag_type(entry, &tag) < 0)
	172	return -errno;
	173
	174	if (tag != ACL_GROUP)
	175	goto next;
	176
	177	gid = acl_get_qualifier(entry);
	178	if (!gid)
	179	return -errno;
478c8269	180
e346512c LP	181	if (in_gid(*gid) > 0) {
	182	if (!ret_groups)
	183	return true;
	184
	185	ret = true;
	186	}
	187
	188	if (ret_groups) {
	189	char *name;
478c8269 ZJS	190
478c8269 ZJS	191	name = gid_to_name(*gid);
e346512c LP	192	if (!name)
	193	return -ENOMEM;
	194
	195	r = strv_consume(&g, name);
	196	if (r < 0)
	197	return r;
478c8269 ZJS	198	}
478c8269 ZJS	199
e346512c LP	200	next:
e346512c LP	201	r = acl_get_entry(acl, ACL_NEXT_ENTRY, &entry);
478c8269 ZJS	202	}
478c8269 ZJS	203
1cc6c93a YW	204	if (ret_groups)
1cc6c93a YW	205	*ret_groups = TAKE_PTR(g);
e346512c LP	206
e346512c LP	207	return ret;
478c8269	208	}
f8eeeaf9	209
e738c945	210	int parse_acl(const char text, acl_t acl_access, acl_t *acl_default, bool want_mask) {
848f0178	211	_cleanup_free_ char a = NULL, d = NULL; /* strings are not freed */
f8eeeaf9 ZJS	212	_cleanup_strv_free_ char **split;
	213	char **entry;
	214	int r = -EINVAL;
	215	_cleanup_(acl_freep) acl_t a_acl = NULL, d_acl = NULL;
	216
	217	split = strv_split(text, ",");
	218	if (!split)
e738c945	219	return -ENOMEM;
f8eeeaf9 ZJS	220
	221	STRV_FOREACH(entry, split) {
	222	char *p;
	223
49fe5c09	224	p = STARTSWITH_SET(*entry, "default:", "d:");
f2ea9cc7 Y	225	if (p)
	226	r = strv_push(&d, p);
	227	else
	228	r = strv_push(&a, *entry);
e738c945 LP	229	if (r < 0)
e738c945 LP	230	return r;
f8eeeaf9	231	}
f8eeeaf9 ZJS	232
	233	if (!strv_isempty(a)) {
	234	_cleanup_free_ char *join;
	235
	236	join = strv_join(a, ",");
	237	if (!join)
	238	return -ENOMEM;
	239
	240	a_acl = acl_from_text(join);
	241	if (!a_acl)
e738c945	242	return -errno;
f8eeeaf9	243
50d9e46d ZJS	244	if (want_mask) {
	245	r = calc_acl_mask_if_needed(&a_acl);
	246	if (r < 0)
	247	return r;
	248	}
f8eeeaf9 ZJS	249	}
	250
	251	if (!strv_isempty(d)) {
	252	_cleanup_free_ char *join;
	253
	254	join = strv_join(d, ",");
	255	if (!join)
	256	return -ENOMEM;
	257
	258	d_acl = acl_from_text(join);
	259	if (!d_acl)
e738c945	260	return -errno;
f8eeeaf9	261
50d9e46d ZJS	262	if (want_mask) {
	263	r = calc_acl_mask_if_needed(&d_acl);
	264	if (r < 0)
	265	return r;
	266	}
f8eeeaf9 ZJS	267	}
f8eeeaf9 ZJS	268
1cc6c93a YW	269	*acl_access = TAKE_PTR(a_acl);
1cc6c93a YW	270	*acl_default = TAKE_PTR(d_acl);
e738c945	271
f8eeeaf9 ZJS	272	return 0;
f8eeeaf9 ZJS	273	}
50d9e46d	274
1c73f3bc ZJS	275	static int acl_entry_equal(acl_entry_t a, acl_entry_t b) {
	276	acl_tag_t tag_a, tag_b;
	277
	278	if (acl_get_tag_type(a, &tag_a) < 0)
	279	return -errno;
	280
	281	if (acl_get_tag_type(b, &tag_b) < 0)
	282	return -errno;
	283
	284	if (tag_a != tag_b)
	285	return false;
	286
	287	switch (tag_a) {
	288	case ACL_USER_OBJ:
	289	case ACL_GROUP_OBJ:
	290	case ACL_MASK:
	291	case ACL_OTHER:
	292	/* can have only one of those */
	293	return true;
	294	case ACL_USER: {
76dcbc49	295	_cleanup_(acl_free_uid_tpp) uid_t uid_a = NULL, uid_b = NULL;
1c73f3bc ZJS	296
	297	uid_a = acl_get_qualifier(a);
	298	if (!uid_a)
	299	return -errno;
	300
	301	uid_b = acl_get_qualifier(b);
	302	if (!uid_b)
	303	return -errno;
	304
	305	return uid_a == uid_b;
	306	}
	307	case ACL_GROUP: {
76dcbc49	308	_cleanup_(acl_free_gid_tpp) gid_t gid_a = NULL, gid_b = NULL;
1c73f3bc ZJS	309
	310	gid_a = acl_get_qualifier(a);
	311	if (!gid_a)
	312	return -errno;
	313
	314	gid_b = acl_get_qualifier(b);
	315	if (!gid_b)
	316	return -errno;
	317
	318	return gid_a == gid_b;
	319	}
	320	default:
	321	assert_not_reached("Unknown acl tag type");
	322	}
	323	}
	324
	325	static int find_acl_entry(acl_t acl, acl_entry_t entry, acl_entry_t *out) {
	326	acl_entry_t i;
	327	int r;
	328
	329	for (r = acl_get_entry(acl, ACL_FIRST_ENTRY, &i);
	330	r > 0;
	331	r = acl_get_entry(acl, ACL_NEXT_ENTRY, &i)) {
	332
	333	r = acl_entry_equal(i, entry);
	334	if (r < 0)
	335	return r;
	336	if (r > 0) {
	337	*out = i;
	338	return 1;
	339	}
	340	}
	341	if (r < 0)
	342	return -errno;
	343	return 0;
	344	}
	345
50d9e46d ZJS	346	int acls_for_file(const char path, acl_type_t type, acl_t new, acl_t acl) {
	347	_cleanup_(acl_freep) acl_t old;
	348	acl_entry_t i;
dd4105b0	349	int r;
50d9e46d ZJS	350
	351	old = acl_get_file(path, type);
	352	if (!old)
	353	return -errno;
	354
dd4105b0 ZJS	355	for (r = acl_get_entry(new, ACL_FIRST_ENTRY, &i);
	356	r > 0;
	357	r = acl_get_entry(new, ACL_NEXT_ENTRY, &i)) {
50d9e46d ZJS	358
	359	acl_entry_t j;
	360
1c73f3bc ZJS	361	r = find_acl_entry(old, i, &j);
	362	if (r < 0)
	363	return r;
	364	if (r == 0)
	365	if (acl_create_entry(&old, &j) < 0)
	366	return -errno;
50d9e46d ZJS	367
	368	if (acl_copy_entry(j, i) < 0)
	369	return -errno;
	370	}
50d9e46d	371	if (r < 0)
dd4105b0	372	return -errno;
50d9e46d	373
1cc6c93a YW	374	*acl = TAKE_PTR(old);
1cc6c93a YW	375
50d9e46d ZJS	376	return 0;
50d9e46d ZJS	377	}
5c3bde3f ZJS	378
	379	int add_acls_for_user(int fd, uid_t uid) {
	380	_cleanup_(acl_freep) acl_t acl = NULL;
	381	acl_entry_t entry;
	382	acl_permset_t permset;
	383	int r;
	384
	385	acl = acl_get_fd(fd);
	386	if (!acl)
	387	return -errno;
	388
	389	r = acl_find_uid(acl, uid, &entry);
	390	if (r <= 0) {
	391	if (acl_create_entry(&acl, &entry) < 0 \|\|
	392	acl_set_tag_type(entry, ACL_USER) < 0 \|\|
	393	acl_set_qualifier(entry, &uid) < 0)
	394	return -errno;
	395	}
	396
	397	/* We do not recalculate the mask unconditionally here,
	398	* so that the fchmod() mask above stays intact. */
	399	if (acl_get_permset(entry, &permset) < 0 \|\|
	400	acl_add_perm(permset, ACL_READ) < 0)
	401	return -errno;
	402
	403	r = calc_acl_mask_if_needed(&acl);
	404	if (r < 0)
	405	return r;
	406
	407	return acl_set_fd(fd, acl);
	408	}