/*-*- Mode: C; c-basic-offset: 8; indent-tabs-mode: nil -*-*/ /*** This file is part of systemd. Copyright 2011,2013 Lennart Poettering systemd is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. systemd is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ #include <assert.h> #include <errno.h> #include <stdbool.h> #include "acl-util.h" #include "util.h" #include "strv.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; 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)) goto calc; } if (r < 0) return -errno; return 0; calc: if (acl_calc_mask(acl_p) < 0) return -errno; return 1; } 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 search_acl_groups(char*** dst, const char* path, bool* belong) { acl_t acl; assert(path); assert(belong); acl = acl_get_file(path, ACL_TYPE_DEFAULT); if (acl) { acl_entry_t entry; int r; r = acl_get_entry(acl, ACL_FIRST_ENTRY, &entry); while (r > 0) { acl_tag_t tag; gid_t *gid; char *name; r = acl_get_tag_type(entry, &tag); if (r < 0) break; if (tag != ACL_GROUP) goto next; gid = acl_get_qualifier(entry); if (!gid) break; if (in_gid(*gid) > 0) { *belong = true; break; } name = gid_to_name(*gid); if (!name) { acl_free(acl); return log_oom(); } r = strv_consume(dst, name); if (r < 0) { acl_free(acl); return log_oom(); } next: r = acl_get_entry(acl, ACL_NEXT_ENTRY, &entry); } acl_free(acl); } return 0; } int parse_acl(char *text, acl_t *acl_access, acl_t *acl_default, bool want_mask) { _cleanup_free_ char **a = NULL, **d = NULL; /* strings are not be 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 log_oom(); STRV_FOREACH(entry, split) { char *p; p = startswith(*entry, "default:"); if (!p) p = startswith(*entry, "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 -EINVAL; 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 -EINVAL; if (want_mask) { r = calc_acl_mask_if_needed(&d_acl); if (r < 0) return r; } } *acl_access = a_acl; *acl_default = d_acl; a_acl = d_acl = NULL; 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; if (acl_create_entry(&old, &j) < 0) return -errno; if (acl_copy_entry(j, i) < 0) return -errno; } if (r < 0) return -errno; *acl = old; old = NULL; return 0; }