/* Unix SMB/CIFS implementation. fast routines for getting the wire size of security objects Copyright (C) Andrew Tridgell 2003 Copyright (C) Stefan Metzmacher 2006-2008 This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program 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 General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . */ #include "includes.h" #include "librpc/gen_ndr/ndr_security.h" #include "../libcli/security/security.h" /* * Find the wire size of a security_ace that has no trailing coda. * This is used in ndr_pull_security_ace() generated from security.idl * to work out where the coda starts (and in ndr_size_security_ace() * just below). */ static size_t ndr_size_security_ace_core(const struct security_ace *ace, libndr_flags flags) { size_t ret; if (!ace) return 0; ret = 8 + ndr_size_dom_sid(&ace->trustee, flags); if (sec_ace_object(ace->type)) { ret += 4; /* uint32 bitmap ace->object.object.flags */ if (ace->object.object.flags & SEC_ACE_OBJECT_TYPE_PRESENT) { ret += 16; /* GUID ace->object.object.type.type */ } if (ace->object.object.flags & SEC_ACE_INHERITED_OBJECT_TYPE_PRESENT) { ret += 16; /* GUID ace->object.object.inherited_type.inherited_type */ } } return ret; } /* return the wire size of a security_ace */ size_t ndr_size_security_ace(const struct security_ace *ace, libndr_flags flags) { size_t base = ndr_size_security_ace_core(ace, flags); size_t ret = base; if (sec_ace_callback(ace->type)) { ret += ace->coda.conditions.length; } else if (ace->type == SEC_ACE_TYPE_SYSTEM_RESOURCE_ATTRIBUTE) { ret += ndr_size_security_ace_coda(&ace->coda, ace->type, flags); } else { /* * Normal ACEs have a coda.ignored blob that is always or * almost always empty. We aren't going to push it (it is * ignored), so we don't add that length to the size. */ } /* round up to a multiple of 4 (MS-DTYP 2.4.4.1) */ ret = (ret + 3ULL) & ~3ULL; if (unlikely(ret < base)) { /* overflow, and there's not much we can do anyway */ return 0; } return ret; } static inline enum ndr_err_code ndr_maybe_pull_security_ace_object_ctr(struct ndr_pull *ndr, ndr_flags_type ndr_flags, struct security_ace *r) { /* * If this is not an object ACE (as is usually common), * ndr_pull_security_ace_object_ctr() will do nothing. * * By avoiding calling the function in that case, we avoid some * tallocing and ndr token busywork. */ bool is_object = sec_ace_object(r->type); if (is_object) { NDR_CHECK(ndr_pull_set_switch_value(ndr, &r->object, is_object)); NDR_CHECK(ndr_pull_security_ace_object_ctr(ndr, ndr_flags, &r->object)); } return NDR_ERR_SUCCESS; } _PUBLIC_ enum ndr_err_code ndr_pull_security_ace(struct ndr_pull *ndr, ndr_flags_type ndr_flags, struct security_ace *r) { NDR_PULL_CHECK_FLAGS(ndr, ndr_flags); if (ndr_flags & NDR_SCALARS) { NDR_CHECK(ndr_pull_align(ndr, 5)); NDR_CHECK(ndr_pull_security_ace_type(ndr, NDR_SCALARS, &r->type)); NDR_CHECK(ndr_pull_security_ace_flags(ndr, NDR_SCALARS, &r->flags)); NDR_CHECK(ndr_pull_uint16(ndr, NDR_SCALARS, &r->size)); NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &r->access_mask)); NDR_CHECK(ndr_maybe_pull_security_ace_object_ctr(ndr, NDR_SCALARS, r)); NDR_CHECK(ndr_pull_dom_sid(ndr, NDR_SCALARS, &r->trustee)); if (!sec_ace_has_extra_blob(r->type)) { r->coda.ignored.data = NULL; r->coda.ignored.length = 0; } else { struct ndr_pull *_ndr_coda; ssize_t sub_size = ndr_subcontext_size_of_ace_coda(r, r->size, ndr->flags); NDR_CHECK(ndr_pull_subcontext_start(ndr, &_ndr_coda, 0, sub_size)); NDR_CHECK(ndr_pull_set_switch_value(_ndr_coda, &r->coda, r->type)); NDR_CHECK(ndr_pull_security_ace_coda(_ndr_coda, NDR_SCALARS|NDR_BUFFERS, &r->coda)); NDR_CHECK(ndr_pull_subcontext_end(ndr, _ndr_coda, 0, sub_size)); } NDR_CHECK(ndr_pull_trailer_align(ndr, 5)); } if (ndr_flags & NDR_BUFFERS) { NDR_CHECK(ndr_maybe_pull_security_ace_object_ctr(ndr, NDR_BUFFERS, r)); } return NDR_ERR_SUCCESS; } static inline enum ndr_err_code ndr_maybe_push_security_ace_object_ctr(struct ndr_push *ndr, ndr_flags_type ndr_flags, const struct security_ace *r) { /* * ndr_push_security_ace_object_ctr() does nothing (except tallocing * and ndr_token fiddling) unless the ACE is an object ACE, which is * usually very unlikely. */ bool is_object = sec_ace_object(r->type); if (is_object) { NDR_CHECK(ndr_push_set_switch_value(ndr, &r->object, is_object)); NDR_CHECK(ndr_push_security_ace_object_ctr(ndr, ndr_flags, &r->object)); } return NDR_ERR_SUCCESS; } _PUBLIC_ enum ndr_err_code ndr_push_security_ace(struct ndr_push *ndr, ndr_flags_type ndr_flags, const struct security_ace *r) { NDR_PUSH_CHECK_FLAGS(ndr, ndr_flags); if (ndr_flags & NDR_SCALARS) { NDR_CHECK(ndr_push_align(ndr, 5)); NDR_CHECK(ndr_push_security_ace_type(ndr, NDR_SCALARS, r->type)); NDR_CHECK(ndr_push_security_ace_flags(ndr, NDR_SCALARS, r->flags)); NDR_CHECK(ndr_push_uint16(ndr, NDR_SCALARS, ndr_size_security_ace(r, ndr->flags))); NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, r->access_mask)); NDR_CHECK(ndr_maybe_push_security_ace_object_ctr(ndr, NDR_SCALARS, r)); NDR_CHECK(ndr_push_dom_sid(ndr, NDR_SCALARS, &r->trustee)); if (sec_ace_has_extra_blob(r->type)) { struct ndr_push *_ndr_coda; size_t coda_size = ndr_subcontext_size_of_ace_coda( r, ndr_size_security_ace(r, ndr->flags), ndr->flags); NDR_CHECK(ndr_push_subcontext_start(ndr, &_ndr_coda, 0, coda_size)); NDR_CHECK(ndr_push_set_switch_value(_ndr_coda, &r->coda, r->type)); NDR_CHECK(ndr_push_security_ace_coda(_ndr_coda, NDR_SCALARS|NDR_BUFFERS, &r->coda)); NDR_CHECK(ndr_push_subcontext_end(ndr, _ndr_coda, 0, coda_size)); } NDR_CHECK(ndr_push_trailer_align(ndr, 5)); } if (ndr_flags & NDR_BUFFERS) { NDR_CHECK(ndr_maybe_push_security_ace_object_ctr(ndr, NDR_BUFFERS, r)); } return NDR_ERR_SUCCESS; } /* * An ACE coda can't be bigger than the space allowed for by * ace->size, so we need to check this from the context of the ACE. * * Usually the coda also can't be any smaller than the remaining * space, because it is defined as a blob consuming everything it can. * * This is only used to find the size for the coda subcontext in * security.idl. */ size_t ndr_subcontext_size_of_ace_coda(const struct security_ace *ace, size_t ace_size, libndr_flags flags) { size_t core_size; if (ace_size == 0) { return 0; } core_size = ndr_size_security_ace_core(ace, flags); if (ace_size < core_size) { return 0; } return ace_size - core_size; } /* return the wire size of a security_acl */ size_t ndr_size_security_acl(const struct security_acl *theacl, libndr_flags flags) { size_t ret; int i; if (!theacl) return 0; ret = 8; for (i=0;inum_aces;i++) { ret += ndr_size_security_ace(&theacl->aces[i], flags); } return ret; } /* return the wire size of a security descriptor */ size_t ndr_size_security_descriptor(const struct security_descriptor *sd, libndr_flags flags) { size_t ret; if (!sd) return 0; ret = 20; ret += ndr_size_dom_sid(sd->owner_sid, flags); ret += ndr_size_dom_sid(sd->group_sid, flags); ret += ndr_size_security_acl(sd->dacl, flags); ret += ndr_size_security_acl(sd->sacl, flags); return ret; } /* return the wire size of a dom_sid */ size_t ndr_size_dom_sid(const struct dom_sid *sid, libndr_flags flags) { if (!sid) return 0; return 8 + 4*sid->num_auths; } size_t ndr_size_dom_sid28(const struct dom_sid *sid, libndr_flags flags) { if (all_zero((const uint8_t *)sid, sizeof(struct dom_sid))) { return 0; } return ndr_size_dom_sid(sid, flags); } size_t ndr_size_dom_sid0(const struct dom_sid *sid, libndr_flags flags) { return ndr_size_dom_sid28(sid, flags); } /* print a dom_sid */ void ndr_print_dom_sid(struct ndr_print *ndr, const char *name, const struct dom_sid *sid) { struct dom_sid_buf buf; ndr->print(ndr, "%-25s: %s", name, dom_sid_str_buf(sid, &buf)); } void ndr_print_dom_sid2(struct ndr_print *ndr, const char *name, const struct dom_sid *sid) { ndr_print_dom_sid(ndr, name, sid); } void ndr_print_dom_sid28(struct ndr_print *ndr, const char *name, const struct dom_sid *sid) { ndr_print_dom_sid(ndr, name, sid); } void ndr_print_dom_sid0(struct ndr_print *ndr, const char *name, const struct dom_sid *sid) { ndr_print_dom_sid(ndr, name, sid); } /* parse a dom_sid2 - this is a dom_sid but with an extra copy of the num_auths field */ enum ndr_err_code ndr_pull_dom_sid2(struct ndr_pull *ndr, ndr_flags_type ndr_flags, struct dom_sid *sid) { uint32_t num_auths; if (!(ndr_flags & NDR_SCALARS)) { return NDR_ERR_SUCCESS; } NDR_CHECK(ndr_pull_uint3264(ndr, NDR_SCALARS, &num_auths)); NDR_CHECK(ndr_pull_dom_sid(ndr, ndr_flags, sid)); if (sid->num_auths != num_auths) { return ndr_pull_error(ndr, NDR_ERR_ARRAY_SIZE, "Bad num_auths %"PRIu32"; should equal %"PRId8, num_auths, sid->num_auths); } return NDR_ERR_SUCCESS; } /* parse a dom_sid2 - this is a dom_sid but with an extra copy of the num_auths field */ enum ndr_err_code ndr_push_dom_sid2(struct ndr_push *ndr, ndr_flags_type ndr_flags, const struct dom_sid *sid) { if (!(ndr_flags & NDR_SCALARS)) { return NDR_ERR_SUCCESS; } NDR_CHECK(ndr_push_uint3264(ndr, NDR_SCALARS, sid->num_auths)); return ndr_push_dom_sid(ndr, ndr_flags, sid); } /* parse a dom_sid28 - this is a dom_sid in a fixed 28 byte buffer, so we need to ensure there are only up to 5 sub_auth */ enum ndr_err_code ndr_pull_dom_sid28(struct ndr_pull *ndr, ndr_flags_type ndr_flags, struct dom_sid *sid) { enum ndr_err_code status; struct ndr_pull *subndr; if (!(ndr_flags & NDR_SCALARS)) { return NDR_ERR_SUCCESS; } subndr = talloc_zero(ndr, struct ndr_pull); NDR_ERR_HAVE_NO_MEMORY(subndr); subndr->flags = ndr->flags; subndr->current_mem_ctx = ndr->current_mem_ctx; subndr->data = ndr->data + ndr->offset; subndr->data_size = 28; subndr->offset = 0; status = ndr_pull_advance(ndr, 28); if (!NDR_ERR_CODE_IS_SUCCESS(status)) { talloc_free(subndr); return status; } status = ndr_pull_dom_sid(subndr, ndr_flags, sid); if (!NDR_ERR_CODE_IS_SUCCESS(status)) { /* handle a w2k bug which send random data in the buffer */ ZERO_STRUCTP(sid); } else if (sid->num_auths == 0) { ZERO_STRUCT(sid->sub_auths); } talloc_free(subndr); return NDR_ERR_SUCCESS; } /* push a dom_sid28 - this is a dom_sid in a 28 byte fixed buffer */ enum ndr_err_code ndr_push_dom_sid28(struct ndr_push *ndr, ndr_flags_type ndr_flags, const struct dom_sid *sid) { uint32_t old_offset; uint32_t padding; if (!(ndr_flags & NDR_SCALARS)) { return NDR_ERR_SUCCESS; } if (sid->num_auths > 5) { return ndr_push_error(ndr, NDR_ERR_RANGE, "dom_sid28 allows only up to 5 sub auths [%"PRId8"]", sid->num_auths); } old_offset = ndr->offset; NDR_CHECK(ndr_push_dom_sid(ndr, ndr_flags, sid)); padding = 28 - (ndr->offset - old_offset); if (padding > 0) { NDR_CHECK(ndr_push_zero(ndr, padding)); } return NDR_ERR_SUCCESS; } /* parse a dom_sid0 - this is a dom_sid in a variable byte buffer, which is maybe empty */ enum ndr_err_code ndr_pull_dom_sid0(struct ndr_pull *ndr, ndr_flags_type ndr_flags, struct dom_sid *sid) { if (!(ndr_flags & NDR_SCALARS)) { return NDR_ERR_SUCCESS; } if (ndr->data_size == ndr->offset) { ZERO_STRUCTP(sid); return NDR_ERR_SUCCESS; } return ndr_pull_dom_sid(ndr, ndr_flags, sid); } /* push a dom_sid0 - this is a dom_sid in a variable byte buffer, which is maybe empty */ enum ndr_err_code ndr_push_dom_sid0(struct ndr_push *ndr, ndr_flags_type ndr_flags, const struct dom_sid *sid) { if (!(ndr_flags & NDR_SCALARS)) { return NDR_ERR_SUCCESS; } if (!sid) { return NDR_ERR_SUCCESS; } if (all_zero((const uint8_t *)sid, sizeof(struct dom_sid))) { return NDR_ERR_SUCCESS; } return ndr_push_dom_sid(ndr, ndr_flags, sid); } _PUBLIC_ enum ndr_err_code ndr_push_dom_sid(struct ndr_push *ndr, ndr_flags_type ndr_flags, const struct dom_sid *r) { uint32_t cntr_sub_auths_0; if (ndr_flags & NDR_SCALARS) { NDR_CHECK(ndr_push_align(ndr, 4)); NDR_CHECK(ndr_push_uint8(ndr, NDR_SCALARS, r->sid_rev_num)); NDR_CHECK(ndr_push_int8(ndr, NDR_SCALARS, r->num_auths)); NDR_CHECK(ndr_push_array_uint8(ndr, NDR_SCALARS, r->id_auth, 6)); if (r->num_auths < 0 || r->num_auths > ARRAY_SIZE(r->sub_auths)) { return ndr_push_error(ndr, NDR_ERR_RANGE, "value (%"PRId8") out of range (0 - %zu)", r->num_auths, ARRAY_SIZE(r->sub_auths)); } for (cntr_sub_auths_0 = 0; cntr_sub_auths_0 < r->num_auths; cntr_sub_auths_0++) { NDR_CHECK(ndr_push_uint32(ndr, NDR_SCALARS, r->sub_auths[cntr_sub_auths_0])); } } return NDR_ERR_SUCCESS; } _PUBLIC_ enum ndr_err_code ndr_pull_dom_sid(struct ndr_pull *ndr, ndr_flags_type ndr_flags, struct dom_sid *r) { uint32_t cntr_sub_auths_0; if (ndr_flags & NDR_SCALARS) { NDR_CHECK(ndr_pull_align(ndr, 4)); NDR_CHECK(ndr_pull_uint8(ndr, NDR_SCALARS, &r->sid_rev_num)); NDR_CHECK(ndr_pull_int8(ndr, NDR_SCALARS, &r->num_auths)); if (r->num_auths < 0 || r->num_auths > ARRAY_SIZE(r->sub_auths)) { return ndr_pull_error(ndr, NDR_ERR_RANGE, "value (%"PRId8") out of range (0 - %zu)", r->num_auths, ARRAY_SIZE(r->sub_auths)); } NDR_CHECK(ndr_pull_array_uint8(ndr, NDR_SCALARS, r->id_auth, 6)); ZERO_STRUCT(r->sub_auths); for (cntr_sub_auths_0 = 0; cntr_sub_auths_0 < r->num_auths; cntr_sub_auths_0++) { NDR_CHECK(ndr_pull_uint32(ndr, NDR_SCALARS, &r->sub_auths[cntr_sub_auths_0])); } } return NDR_ERR_SUCCESS; }