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-rw-r--r--src/shared/acl-util.c45
1 files changed, 38 insertions, 7 deletions
diff --git a/src/shared/acl-util.c b/src/shared/acl-util.c
index 35f2e1b67d..b4028564c2 100644
--- a/src/shared/acl-util.c
+++ b/src/shared/acl-util.c
@@ -71,6 +71,7 @@ int acl_find_uid(acl_t acl, uid_t uid, acl_entry_t *entry) {
int calc_acl_mask_if_needed(acl_t *acl_p) {
acl_entry_t i;
int r;
+ bool need = false;
assert(acl_p);
@@ -85,17 +86,16 @@ int calc_acl_mask_if_needed(acl_t *acl_p) {
if (tag == ACL_MASK)
return 0;
- if (IN_SET(tag, ACL_USER, ACL_GROUP)) {
- if (acl_calc_mask(acl_p) < 0)
- return -errno;
-
- return 1;
- }
+ if (IN_SET(tag, ACL_USER, ACL_GROUP))
+ need = true;
}
if (r < 0)
return -errno;
- return 0;
+ 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) {
@@ -398,3 +398,34 @@ int acls_for_file(const char *path, acl_type_t type, acl_t new, acl_t *acl) {
old = NULL;
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);
+}