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acl_calc_mask.c (75185) acl_calc_mask.c (75928)
1/*
2 * Copyright (c) 2001 Chris D. Faulhaber
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

--- 9 unchanged lines hidden (view full) ---

18 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
25 *
1/*
2 * Copyright (c) 2001 Chris D. Faulhaber
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright

--- 9 unchanged lines hidden (view full) ---

18 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
19 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
20 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
21 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
22 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
23 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
24 * POSSIBILITY OF SUCH DAMAGE.
25 *
26 * $FreeBSD: head/lib/libc/posix1e/acl_calc_mask.c 75185 2001-04-04 18:00:52Z tmm $
26 * $FreeBSD: head/lib/libc/posix1e/acl_calc_mask.c 75928 2001-04-24 22:45:41Z jedgar $
27 */
28
29#include <sys/types.h>
30#include "namespace.h"
31#include <sys/acl.h>
32#include "un-namespace.h"
33
34#include <errno.h>
27 */
28
29#include <sys/types.h>
30#include "namespace.h"
31#include <sys/acl.h>
32#include "un-namespace.h"
33
34#include <errno.h>
35#include <stdio.h>
35
36/*
36
37/*
37 * acl_calc_mask() calculates and set the permissions associated
38 * with the ACL_MASK ACL entry. If the ACL already contains an
39 * ACL_MASK entry, its permissions shall be overwritten; if not,
40 * one shall be added.
38 * acl_calc_mask() (23.4.2): calculate and set the permissions
39 * associated with the ACL_MASK ACL entry. If the ACL already
40 * contains an ACL_MASK entry, its permissions shall be
41 * overwritten; if not, one shall be added.
41 */
42int
43acl_calc_mask(acl_t *acl_p)
44{
42 */
43int
44acl_calc_mask(acl_t *acl_p)
45{
45 acl_t acl_new;
46 int group_obj, i, mask_mode, mask_num, other_obj, user_obj;
46 struct acl *acl_int, *acl_int_new;
47 acl_t acl_new;
48 int i, mask_mode, mask_num;
47
49
48 /* check args */
49 if (!acl_p || !*acl_p || ((*acl_p)->acl_cnt < 3) ||
50 ((*acl_p)->acl_cnt > ACL_MAX_ENTRIES)) {
50 /*
51 * (23.4.2.4) requires acl_p to point to a pointer to a valid ACL.
52 * Since one of the primary reasons to use this function would be
53 * to calculate the appropriate mask to obtain a valid ACL, we only
54 * perform sanity checks here and validate the ACL prior to
55 * returning.
56 */
57 if (!acl_p || !*acl_p) {
51 errno = EINVAL;
52 return -1;
53 }
58 errno = EINVAL;
59 return -1;
60 }
61 acl_int = &(*acl_p)->ats_acl;
62 if ((acl_int->acl_cnt < 3) || (acl_int->acl_cnt > ACL_MAX_ENTRIES)) {
63 errno = EINVAL;
64 return -1;
65 }
54
55 acl_new = acl_dup(*acl_p);
56 if (!acl_new)
57 return -1;
66
67 acl_new = acl_dup(*acl_p);
68 if (!acl_new)
69 return -1;
70 acl_int_new = &acl_new->ats_acl;
58
71
59 user_obj = group_obj = other_obj = mask_mode = 0;
72 mask_mode = 0;
60 mask_num = -1;
61
62 /* gather permissions and find a mask entry */
73 mask_num = -1;
74
75 /* gather permissions and find a mask entry */
63 for (i = 0; i < acl_new->acl_cnt; i++) {
64 switch(acl_new->acl_entry[i].ae_tag) {
65 case ACL_USER_OBJ:
66 user_obj++;
67 break;
68 case ACL_OTHER:
69 other_obj++;
70 break;
71 case ACL_GROUP_OBJ:
72 group_obj++;
73 /* FALLTHROUGH */
74 case ACL_GROUP:
76 for (i = 0; i < acl_int_new->acl_cnt; i++) {
77 switch(acl_int_new->acl_entry[i].ae_tag) {
75 case ACL_USER:
78 case ACL_USER:
79 case ACL_GROUP:
80 case ACL_GROUP_OBJ:
76 mask_mode |=
81 mask_mode |=
77 acl_new->acl_entry[i].ae_perm & ACL_PERM_BITS;
82 acl_int_new->acl_entry[i].ae_perm & ACL_PERM_BITS;
78 break;
79 case ACL_MASK:
80 mask_num = i;
81 break;
83 break;
84 case ACL_MASK:
85 mask_num = i;
86 break;
82 default:
83 errno = EINVAL;
84 acl_free(acl_new);
85 return -1;
86 /* NOTREACHED */
87 }
88 }
87 }
88 }
89 if ((user_obj != 1) || (group_obj != 1) || (other_obj != 1)) {
90 errno = EINVAL;
91 acl_free(acl_new);
92 return -1;
93 }
89
94 /* if a mask entry already exists, overwrite the perms */
90 /* if a mask entry already exists, overwrite the perms */
95 if (mask_num != -1) {
96 acl_new->acl_entry[mask_num].ae_perm = mask_mode;
97 } else {
91 if (mask_num != -1)
92 acl_int_new->acl_entry[mask_num].ae_perm = mask_mode;
93 else {
98 /* if no mask exists, check acl_cnt... */
94 /* if no mask exists, check acl_cnt... */
99 if (acl_new->acl_cnt == ACL_MAX_ENTRIES) {
100 errno = EINVAL;
101 acl_free(acl_new);
95 if (acl_int_new->acl_cnt == ACL_MAX_ENTRIES) {
96 errno = ENOMEM;
102 return -1;
103 }
104 /* ...and add the mask entry */
97 return -1;
98 }
99 /* ...and add the mask entry */
105 acl_new->acl_entry[acl_new->acl_cnt].ae_tag = ACL_MASK;
106 acl_new->acl_entry[acl_new->acl_cnt].ae_id = 0;
107 acl_new->acl_entry[acl_new->acl_cnt].ae_perm = mask_mode;
108 acl_new->acl_cnt++;
100 acl_int_new->acl_entry[acl_int_new->acl_cnt].ae_tag = ACL_MASK;
101 acl_int_new->acl_entry[acl_int_new->acl_cnt].ae_id =
102 ACL_UNDEFINED_ID;
103 acl_int_new->acl_entry[acl_int_new->acl_cnt].ae_perm =
104 mask_mode;
105 acl_int_new->acl_cnt++;
109 }
110
111 if (acl_valid(acl_new) == -1) {
112 errno = EINVAL;
113 acl_free(acl_new);
114 return -1;
115 }
116
117 **acl_p = *acl_new;
118 acl_free(acl_new);
119
120 return 0;
121}
106 }
107
108 if (acl_valid(acl_new) == -1) {
109 errno = EINVAL;
110 acl_free(acl_new);
111 return -1;
112 }
113
114 **acl_p = *acl_new;
115 acl_free(acl_new);
116
117 return 0;
118}