diff options
Diffstat (limited to 'librpc/ndr/ndr_sec_helper.c')
| -rw-r--r-- | librpc/ndr/ndr_sec_helper.c | 457 |
1 files changed, 457 insertions, 0 deletions
diff --git a/librpc/ndr/ndr_sec_helper.c b/librpc/ndr/ndr_sec_helper.c new file mode 100644 index 0000000..1a156b0 --- /dev/null +++ b/librpc/ndr/ndr_sec_helper.c @@ -0,0 +1,457 @@ +/* + 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 <http://www.gnu.org/licenses/>. +*/ + + +#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;i<theacl->num_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; +} |