/* Unix SMB/CIFS implementation. Infrastructure for async ldap client requests Copyright (C) Volker Lendecke 2009 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 "tldap.h" #include "tldap_util.h" bool tldap_entry_values(struct tldap_message *msg, const char *attribute, int *num_values, DATA_BLOB **values) { struct tldap_attribute *attributes; int i, num_attributes; if (!tldap_entry_attributes(msg, &num_attributes, &attributes)) { return false; } for (i=0; i<num_attributes; i++) { if (strequal(attribute, attributes[i].name)) { break; } } if (i == num_attributes) { return false; } *num_values = attributes[i].num_values; *values = attributes[i].values; return true; } bool tldap_get_single_valueblob(struct tldap_message *msg, const char *attribute, DATA_BLOB *blob) { int num_values; DATA_BLOB *values; if (attribute == NULL) { return NULL; } if (!tldap_entry_values(msg, attribute, &num_values, &values)) { return NULL; } if (num_values != 1) { return NULL; } *blob = values[0]; return true; } char *tldap_talloc_single_attribute(struct tldap_message *msg, const char *attribute, TALLOC_CTX *mem_ctx) { DATA_BLOB val; char *result; size_t len; if (!tldap_get_single_valueblob(msg, attribute, &val)) { return false; } if (!convert_string_talloc(mem_ctx, CH_UTF8, CH_UNIX, val.data, val.length, &result, &len, false)) { return NULL; } return result; } bool tldap_pull_binsid(struct tldap_message *msg, const char *attribute, struct dom_sid *sid) { DATA_BLOB val; if (!tldap_get_single_valueblob(msg, attribute, &val)) { return false; } return sid_parse((char *)val.data, val.length, sid); } bool tldap_pull_guid(struct tldap_message *msg, const char *attribute, struct GUID *guid) { DATA_BLOB val; if (!tldap_get_single_valueblob(msg, attribute, &val)) { return false; } return NT_STATUS_IS_OK(GUID_from_data_blob(&val, guid)); } static bool tldap_add_blob_vals(TALLOC_CTX *mem_ctx, struct tldap_mod *mod, int num_newvals, DATA_BLOB *newvals) { int num_values = talloc_array_length(mod->values); int i; DATA_BLOB *tmp; tmp = talloc_realloc(mem_ctx, mod->values, DATA_BLOB, num_values + num_newvals); if (tmp == NULL) { return false; } mod->values = tmp; for (i=0; i<num_newvals; i++) { mod->values[i+num_values].data = (uint8_t *)talloc_memdup( mod->values, newvals[i].data, newvals[i].length); if (mod->values[i+num_values].data == NULL) { return false; } mod->values[i+num_values].length = newvals[i].length; } mod->num_values = num_values + num_newvals; return true; } bool tldap_add_mod_blobs(TALLOC_CTX *mem_ctx, struct tldap_mod **pmods, int mod_op, const char *attrib, int num_newvals, DATA_BLOB *newvals) { struct tldap_mod new_mod; struct tldap_mod *mods = *pmods; struct tldap_mod *mod = NULL; int i, num_mods; if (mods == NULL) { mods = talloc_array(mem_ctx, struct tldap_mod, 0); } if (mods == NULL) { return false; } num_mods = talloc_array_length(mods); for (i=0; i<num_mods; i++) { if ((mods[i].mod_op == mod_op) && strequal(mods[i].attribute, attrib)) { mod = &mods[i]; break; } } if (mod == NULL) { new_mod.mod_op = mod_op; new_mod.attribute = talloc_strdup(mods, attrib); if (new_mod.attribute == NULL) { return false; } new_mod.num_values = 0; new_mod.values = NULL; mod = &new_mod; } if ((num_newvals != 0) && !tldap_add_blob_vals(mods, mod, num_newvals, newvals)) { return false; } if (i == num_mods) { mods = talloc_realloc(talloc_tos(), mods, struct tldap_mod, num_mods+1); if (mods == NULL) { return false; } mods[num_mods] = *mod; } *pmods = mods; return true; } bool tldap_add_mod_str(TALLOC_CTX *mem_ctx, struct tldap_mod **pmods, int mod_op, const char *attrib, const char *str) { DATA_BLOB utf8; bool ret; if (!convert_string_talloc(talloc_tos(), CH_UNIX, CH_UTF8, str, strlen(str), &utf8.data, &utf8.length, false)) { return false; } ret = tldap_add_mod_blobs(mem_ctx, pmods, mod_op, attrib, 1, &utf8); TALLOC_FREE(utf8.data); return ret; } static bool tldap_make_mod_blob_int(struct tldap_message *existing, TALLOC_CTX *mem_ctx, int *pnum_mods, struct tldap_mod **pmods, const char *attrib, DATA_BLOB newval, int (*comparison)(const DATA_BLOB *d1, const DATA_BLOB *d2)) { int num_values = 0; DATA_BLOB *values = NULL; DATA_BLOB oldval = data_blob_null; if ((existing != NULL) && tldap_entry_values(existing, attrib, &num_values, &values)) { if (num_values > 1) { /* can't change multivalue attributes atm */ return false; } if (num_values == 1) { oldval = values[0]; } } if ((oldval.data != NULL) && (newval.data != NULL) && (comparison(&oldval, &newval) == 0)) { /* Believe it or not, but LDAP will deny a delete and an add at the same time if the values are the same... */ DEBUG(10,("smbldap_make_mod_blob: attribute |%s| not " "changed.\n", attrib)); return true; } if (oldval.data != NULL) { /* By deleting exactly the value we found in the entry this * should be race-free in the sense that the LDAP-Server will * deny the complete operation if somebody changed the * attribute behind our back. */ /* This will also allow modifying single valued attributes in * Novell NDS. In NDS you have to first remove attribute and * then you could add new value */ DEBUG(10, ("smbldap_make_mod_blob: deleting attribute |%s|\n", attrib)); if (!tldap_add_mod_blobs(mem_ctx, pmods, TLDAP_MOD_DELETE, attrib, 1, &oldval)) { return false; } } /* Regardless of the real operation (add or modify) we add the new value here. We rely on deleting the old value, should it exist. */ if (newval.data != NULL) { DEBUG(10, ("smbldap_make_mod: adding attribute |%s| value len " "%d\n", attrib, (int)newval.length)); if (!tldap_add_mod_blobs(mem_ctx, pmods, TLDAP_MOD_ADD, attrib, 1, &newval)) { return false; } } *pnum_mods = talloc_array_length(*pmods); return true; } bool tldap_make_mod_blob(struct tldap_message *existing, TALLOC_CTX *mem_ctx, int *pnum_mods, struct tldap_mod **pmods, const char *attrib, DATA_BLOB newval) { return tldap_make_mod_blob_int(existing, mem_ctx, pnum_mods, pmods, attrib, newval, data_blob_cmp); } static int compare_utf8_blobs(const DATA_BLOB *d1, const DATA_BLOB *d2) { char *s1, *s2; size_t s1len, s2len; int ret; if (!convert_string_talloc(talloc_tos(), CH_UTF8, CH_UNIX, d1->data, d1->length, &s1, &s1len, false)) { /* can't do much here */ return 0; } if (!convert_string_talloc(talloc_tos(), CH_UTF8, CH_UNIX, d2->data, d2->length, &s2, &s2len, false)) { /* can't do much here */ TALLOC_FREE(s1); return 0; } ret = StrCaseCmp(s1, s2); TALLOC_FREE(s2); TALLOC_FREE(s1); return ret; } bool tldap_make_mod_fmt(struct tldap_message *existing, TALLOC_CTX *mem_ctx, int *pnum_mods, struct tldap_mod **pmods, const char *attrib, const char *fmt, ...) { va_list ap; char *newval; bool ret; DATA_BLOB blob = data_blob_null; va_start(ap, fmt); newval = talloc_vasprintf(talloc_tos(), fmt, ap); va_end(ap); if (newval == NULL) { return false; } blob.length = strlen(newval); if (blob.length != 0) { blob.data = CONST_DISCARD(uint8_t *, newval); } ret = tldap_make_mod_blob_int(existing, mem_ctx, pnum_mods, pmods, attrib, blob, compare_utf8_blobs); TALLOC_FREE(newval); return ret; } const char *tldap_errstr(TALLOC_CTX *mem_ctx, struct tldap_context *ld, int rc) { const char *ld_error = NULL; char *res; ld_error = tldap_msg_diagnosticmessage(tldap_ctx_lastmsg(ld)); res = talloc_asprintf(mem_ctx, "LDAP error %d (%s), %s", rc, tldap_err2string(rc), ld_error ? ld_error : "unknown"); return res; } int tldap_search_va(struct tldap_context *ld, const char *base, int scope, const char *attrs[], int num_attrs, int attrsonly, TALLOC_CTX *mem_ctx, struct tldap_message ***res, const char *fmt, va_list ap) { char *filter; int ret; filter = talloc_vasprintf(talloc_tos(), fmt, ap); if (filter == NULL) { return TLDAP_NO_MEMORY; } ret = tldap_search(ld, base, scope, filter, attrs, num_attrs, attrsonly, NULL /*sctrls*/, 0, NULL /*cctrls*/, 0, 0 /*timelimit*/, 0 /*sizelimit*/, 0 /*deref*/, mem_ctx, res, NULL); TALLOC_FREE(filter); return ret; } int tldap_search_fmt(struct tldap_context *ld, const char *base, int scope, const char *attrs[], int num_attrs, int attrsonly, TALLOC_CTX *mem_ctx, struct tldap_message ***res, const char *fmt, ...) { va_list ap; int ret; va_start(ap, fmt); ret = tldap_search_va(ld, base, scope, attrs, num_attrs, attrsonly, mem_ctx, res, fmt, ap); va_end(ap); return ret; } bool tldap_pull_uint64(struct tldap_message *msg, const char *attr, uint64_t *presult) { char *str; uint64_t result; str = tldap_talloc_single_attribute(msg, attr, talloc_tos()); if (str == NULL) { DEBUG(10, ("Could not find attribute %s\n", attr)); return false; } result = strtoull(str, NULL, 10); TALLOC_FREE(str); *presult = result; return true; } bool tldap_pull_uint32(struct tldap_message *msg, const char *attr, uint32_t *presult) { uint64_t result; if (!tldap_pull_uint64(msg, attr, &result)) { return false; } *presult = (uint32_t)result; return true; } struct tldap_fetch_rootdse_state { struct tldap_context *ld; struct tldap_message *rootdse; }; static void tldap_fetch_rootdse_done(struct tevent_req *subreq); struct tevent_req *tldap_fetch_rootdse_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev, struct tldap_context *ld) { struct tevent_req *req, *subreq; struct tldap_fetch_rootdse_state *state; static const char *attrs[2] = { "*", "+" }; req = tevent_req_create(mem_ctx, &state, struct tldap_fetch_rootdse_state); if (req == NULL) { return NULL; } state->ld = ld; state->rootdse = NULL; subreq = tldap_search_send( mem_ctx, ev, ld, "", TLDAP_SCOPE_BASE, "(objectclass=*)", attrs, ARRAY_SIZE(attrs), 0, NULL, 0, NULL, 0, 0, 0, 0); if (tevent_req_nomem(subreq, req)) { return tevent_req_post(req, ev); } tevent_req_set_callback(subreq, tldap_fetch_rootdse_done, req); return req; } static void tldap_fetch_rootdse_done(struct tevent_req *subreq) { struct tevent_req *req = tevent_req_callback_data( subreq, struct tevent_req); struct tldap_fetch_rootdse_state *state = tevent_req_data( req, struct tldap_fetch_rootdse_state); struct tldap_message *msg; int rc; rc = tldap_search_recv(subreq, state, &msg); if (rc != TLDAP_SUCCESS) { TALLOC_FREE(subreq); tevent_req_error(req, rc); return; } switch (tldap_msg_type(msg)) { case TLDAP_RES_SEARCH_ENTRY: if (state->rootdse != NULL) { goto protocol_error; } state->rootdse = msg; break; case TLDAP_RES_SEARCH_RESULT: TALLOC_FREE(subreq); if (state->rootdse == NULL) { goto protocol_error; } tevent_req_done(req); break; default: goto protocol_error; } return; protocol_error: tevent_req_error(req, TLDAP_PROTOCOL_ERROR); return; } int tldap_fetch_rootdse_recv(struct tevent_req *req) { struct tldap_fetch_rootdse_state *state = tevent_req_data( req, struct tldap_fetch_rootdse_state); int err; char *dn; if (tevent_req_is_ldap_error(req, &err)) { return err; } /* Trigger parsing the dn, just to make sure it's ok */ if (!tldap_entry_dn(state->rootdse, &dn)) { return TLDAP_DECODING_ERROR; } if (!tldap_context_setattr(state->ld, "tldap:rootdse", &state->rootdse)) { return TLDAP_NO_MEMORY; } return 0; } int tldap_fetch_rootdse(struct tldap_context *ld) { TALLOC_CTX *frame = talloc_stackframe(); struct tevent_context *ev; struct tevent_req *req; int result; ev = event_context_init(frame); if (ev == NULL) { result = TLDAP_NO_MEMORY; goto fail; } req = tldap_fetch_rootdse_send(frame, ev, ld); if (req == NULL) { result = TLDAP_NO_MEMORY; goto fail; } if (!tevent_req_poll(req, ev)) { result = TLDAP_OPERATIONS_ERROR; goto fail; } result = tldap_fetch_rootdse_recv(req); fail: TALLOC_FREE(frame); return result; } struct tldap_message *tldap_rootdse(struct tldap_context *ld) { return talloc_get_type(tldap_context_getattr(ld, "tldap:rootdse"), struct tldap_message); } bool tldap_entry_has_attrvalue(struct tldap_message *msg, const char *attribute, const DATA_BLOB blob) { int i, num_values; DATA_BLOB *values; if (!tldap_entry_values(msg, attribute, &num_values, &values)) { return false; } for (i=0; i<num_values; i++) { if (data_blob_cmp(&values[i], &blob) == 0) { return true; } } return false; } bool tldap_supports_control(struct tldap_context *ld, const char *oid) { struct tldap_message *rootdse = tldap_rootdse(ld); if (rootdse == NULL) { return false; } return tldap_entry_has_attrvalue(rootdse, "supportedControl", data_blob_const(oid, strlen(oid))); } struct tldap_control *tldap_add_control(TALLOC_CTX *mem_ctx, struct tldap_control *ctrls, int num_ctrls, struct tldap_control *ctrl) { struct tldap_control *result; result = talloc_array(mem_ctx, struct tldap_control, num_ctrls+1); if (result == NULL) { return NULL; } memcpy(result, ctrls, sizeof(struct tldap_control) * num_ctrls); result[num_ctrls] = *ctrl; return result; } /* * Find a control returned by the server */ struct tldap_control *tldap_msg_findcontrol(struct tldap_message *msg, const char *oid) { struct tldap_control *controls; int i, num_controls; tldap_msg_sctrls(msg, &num_controls, &controls); for (i=0; i<num_controls; i++) { if (strcmp(controls[i].oid, oid) == 0) { return &controls[i]; } } return NULL; } struct tldap_search_paged_state { struct tevent_context *ev; struct tldap_context *ld; const char *base; const char *filter; int scope; const char **attrs; int num_attrs; int attrsonly; struct tldap_control *sctrls; int num_sctrls; struct tldap_control *cctrls; int num_cctrls; int timelimit; int sizelimit; int deref; int page_size; struct asn1_data *asn1; DATA_BLOB cookie; struct tldap_message *result; }; static struct tevent_req *tldap_ship_paged_search( TALLOC_CTX *mem_ctx, struct tldap_search_paged_state *state) { struct tldap_control *pgctrl; struct asn1_data *asn1; asn1 = asn1_init(state); if (asn1 == NULL) { return NULL; } asn1_push_tag(asn1, ASN1_SEQUENCE(0)); asn1_write_Integer(asn1, state->page_size); asn1_write_OctetString(asn1, state->cookie.data, state->cookie.length); asn1_pop_tag(asn1); if (asn1->has_error) { TALLOC_FREE(asn1); return NULL; } state->asn1 = asn1; pgctrl = &state->sctrls[state->num_sctrls-1]; pgctrl->oid = TLDAP_CONTROL_PAGEDRESULTS; pgctrl->critical = true; if (!asn1_blob(state->asn1, &pgctrl->value)) { TALLOC_FREE(asn1); return NULL; } return tldap_search_send(mem_ctx, state->ev, state->ld, state->base, state->scope, state->filter, state->attrs, state->num_attrs, state->attrsonly, state->sctrls, state->num_sctrls, state->cctrls, state->num_cctrls, state->timelimit, state->sizelimit, state->deref); } static void tldap_search_paged_done(struct tevent_req *subreq); struct tevent_req *tldap_search_paged_send(TALLOC_CTX *mem_ctx, struct tevent_context *ev, struct tldap_context *ld, const char *base, int scope, const char *filter, const char **attrs, int num_attrs, int attrsonly, struct tldap_control *sctrls, int num_sctrls, struct tldap_control *cctrls, int num_cctrls, int timelimit, int sizelimit, int deref, int page_size) { struct tevent_req *req, *subreq; struct tldap_search_paged_state *state; struct tldap_control empty_control; req = tevent_req_create(mem_ctx, &state, struct tldap_search_paged_state); if (req == NULL) { return NULL; } state->ev = ev; state->ld = ld; state->base = base; state->filter = filter; state->scope = scope; state->attrs = attrs; state->num_attrs = num_attrs; state->attrsonly = attrsonly; state->cctrls = cctrls; state->num_cctrls = num_cctrls; state->timelimit = timelimit; state->sizelimit = sizelimit; state->deref = deref; state->page_size = page_size; state->asn1 = NULL; state->cookie = data_blob_null; ZERO_STRUCT(empty_control); state->sctrls = tldap_add_control(state, sctrls, num_sctrls, &empty_control); if (tevent_req_nomem(state->sctrls, req)) { return tevent_req_post(req, ev); } state->num_sctrls = num_sctrls+1; subreq = tldap_ship_paged_search(state, state); if (tevent_req_nomem(subreq, req)) { return tevent_req_post(req, ev); } tevent_req_set_callback(subreq, tldap_search_paged_done, req); return req; } static void tldap_search_paged_done(struct tevent_req *subreq) { struct tevent_req *req = tevent_req_callback_data( subreq, struct tevent_req); struct tldap_search_paged_state *state = tevent_req_data( req, struct tldap_search_paged_state); struct asn1_data *asn1; struct tldap_control *pgctrl; int rc, size; rc = tldap_search_recv(subreq, state, &state->result); if (rc != TLDAP_SUCCESS) { TALLOC_FREE(subreq); tevent_req_error(req, rc); return; } TALLOC_FREE(state->asn1); switch (tldap_msg_type(state->result)) { case TLDAP_RES_SEARCH_ENTRY: case TLDAP_RES_SEARCH_REFERENCE: tevent_req_notify_callback(req); return; case TLDAP_RES_SEARCH_RESULT: break; default: TALLOC_FREE(subreq); tevent_req_error(req, TLDAP_PROTOCOL_ERROR); return; } TALLOC_FREE(subreq); /* We've finished one paged search, fire the next */ pgctrl = tldap_msg_findcontrol(state->result, TLDAP_CONTROL_PAGEDRESULTS); if (pgctrl == NULL) { /* RFC2696 requires the server to return the control */ tevent_req_error(req, TLDAP_PROTOCOL_ERROR); return; } TALLOC_FREE(state->cookie.data); asn1 = asn1_init(talloc_tos()); if (asn1 == NULL) { tevent_req_error(req, TLDAP_NO_MEMORY); return; } asn1_load_nocopy(asn1, pgctrl->value.data, pgctrl->value.length); asn1_start_tag(asn1, ASN1_SEQUENCE(0)); asn1_read_Integer(asn1, &size); asn1_read_OctetString(asn1, state, &state->cookie); asn1_end_tag(asn1); if (asn1->has_error) { tevent_req_error(req, TLDAP_DECODING_ERROR); return; } TALLOC_FREE(asn1); if (state->cookie.length == 0) { /* We're done, no cookie anymore */ tevent_req_done(req); return; } TALLOC_FREE(state->result); subreq = tldap_ship_paged_search(state, state); if (tevent_req_nomem(subreq, req)) { return; } tevent_req_set_callback(subreq, tldap_search_paged_done, req); } int tldap_search_paged_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx, struct tldap_message **pmsg) { struct tldap_search_paged_state *state = tevent_req_data( req, struct tldap_search_paged_state); int err; if (!tevent_req_is_in_progress(req) && tevent_req_is_ldap_error(req, &err)) { return err; } if (tevent_req_is_in_progress(req)) { switch (tldap_msg_type(state->result)) { case TLDAP_RES_SEARCH_ENTRY: case TLDAP_RES_SEARCH_REFERENCE: break; default: return TLDAP_PROTOCOL_ERROR; } } *pmsg = talloc_move(mem_ctx, &state->result); return TLDAP_SUCCESS; }