/* SSSD Async LDAP Helper routines Copyright (C) Simo Sorce - 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 . */ #include #include "util/util.h" #include "providers/ldap/sdap_async_private.h" #define REALM_SEPARATOR '@' #define REPLY_REALLOC_INCREMENT 10 void make_realm_upper_case(const char *upn) { char *c; c = strchr(upn, REALM_SEPARATOR); if (c == NULL) { DEBUG(9, ("No realm delimiter found in upn [%s].\n", upn)); return; } while(*(++c) != '\0') { c[0] = toupper(*c); } return; } /* ==LDAP-Memory-Handling================================================= */ static int lmsg_destructor(void *mem) { ldap_msgfree((LDAPMessage *)mem); return 0; } static int sdap_msg_attach(TALLOC_CTX *memctx, LDAPMessage *msg) { void *h; if (!msg) return EINVAL; h = sss_mem_attach(memctx, msg, lmsg_destructor); if (!h) return ENOMEM; return EOK; } /* ==sdap-hanlde-utility-functions======================================== */ static inline void sdap_handle_release(struct sdap_handle *sh); static int sdap_handle_destructor(void *mem); struct sdap_handle *sdap_handle_create(TALLOC_CTX *memctx) { struct sdap_handle *sh; sh = talloc_zero(memctx, struct sdap_handle); if (!sh) return NULL; talloc_set_destructor((TALLOC_CTX *)sh, sdap_handle_destructor); return sh; } static int sdap_handle_destructor(void *mem) { struct sdap_handle *sh = talloc_get_type(mem, struct sdap_handle); /* if the structure is currently locked, then mark it to be released * and prevent talloc from freeing the memory */ if (sh->destructor_lock) { sh->release_memory = true; return -1; } sdap_handle_release(sh); return 0; } static void sdap_handle_release(struct sdap_handle *sh) { struct sdap_op *op; DEBUG(8, ("Trace: sh[%p], connected[%d], ops[%p], ldap[%p], " "destructor_lock[%d], release_memory[%d]\n", sh, (int)sh->connected, sh->ops, sh->ldap, (int)sh->destructor_lock, (int)sh->release_memory)); if (sh->destructor_lock) return; sh->destructor_lock = true; /* make sure nobody tries to reuse this connection from now on */ sh->connected = false; talloc_zfree(sh->sdap_fd_events); while (sh->ops) { op = sh->ops; op->callback(op, NULL, EIO, op->data); /* calling the callback may result in freeing the op */ /* check if it is still the same or avoid freeing */ if (op == sh->ops) talloc_free(op); } if (sh->ldap) { ldap_unbind_ext(sh->ldap, NULL, NULL); sh->ldap = NULL; } /* ok, we have done the job, unlock now */ sh->destructor_lock = false; /* finally if a destructor was ever called, free sh before * exiting */ if (sh->release_memory) { /* neutralize the destructor as we already handled * all was needed to be released */ talloc_set_destructor((TALLOC_CTX *)sh, NULL); talloc_free(sh); } } /* ==Parse-Results-And-Handle-Disconnections============================== */ static void sdap_process_message(struct tevent_context *ev, struct sdap_handle *sh, LDAPMessage *msg); static void sdap_process_result(struct tevent_context *ev, void *pvt); static void sdap_process_next_reply(struct tevent_context *ev, struct tevent_timer *te, struct timeval tv, void *pvt); void sdap_ldap_result(struct tevent_context *ev, struct tevent_fd *fde, uint16_t flags, void *pvt) { sdap_process_result(ev, pvt); } static void sdap_ldap_next_result(struct tevent_context *ev, struct tevent_timer *te, struct timeval tv, void *pvt) { sdap_process_result(ev, pvt); } static void sdap_process_result(struct tevent_context *ev, void *pvt) { struct sdap_handle *sh = talloc_get_type(pvt, struct sdap_handle); struct timeval no_timeout = {0, 0}; struct tevent_timer *te; LDAPMessage *msg; int ret; DEBUG(8, ("Trace: sh[%p], connected[%d], ops[%p], ldap[%p]\n", sh, (int)sh->connected, sh->ops, sh->ldap)); if (!sh->connected || !sh->ldap) { DEBUG(2, ("ERROR: LDAP connection is not connected!\n")); return; } ret = ldap_result(sh->ldap, LDAP_RES_ANY, 0, &no_timeout, &msg); if (ret == 0) { /* this almost always means we have reached the end of * the list of received messages */ DEBUG(8, ("Trace: ldap_result found nothing!\n")); return; } if (ret == -1) { DEBUG(4, ("ldap_result gave -1, something bad happend!\n")); sdap_handle_release(sh); return; } /* We don't know if this will be the last result. * * important: we must do this before actually processing the message * because the message processing might even free the sdap_handler * so it must be the last operation. * FIXME: use tevent_immediate/tevent_queues, when avilable */ memset(&no_timeout, 0, sizeof(struct timeval)); te = tevent_add_timer(ev, sh, no_timeout, sdap_ldap_next_result, sh); if (!te) { DEBUG(1, ("Failed to add critical timer to fetch next result!\n")); } /* now process this message */ sdap_process_message(ev, sh, msg); } /* process a messgae calling the right operation callback. * msg is completely taken care of (including freeeing it) * NOTE: this function may even end up freeing the sdap_handle * so sdap_hanbdle must not be used after this function is called */ static void sdap_process_message(struct tevent_context *ev, struct sdap_handle *sh, LDAPMessage *msg) { struct sdap_msg *reply; struct sdap_op *op; int msgid; int msgtype; int ret; msgid = ldap_msgid(msg); if (msgid == -1) { DEBUG(2, ("can't fire callback, message id invalid!\n")); ldap_msgfree(msg); return; } msgtype = ldap_msgtype(msg); for (op = sh->ops; op; op = op->next) { if (op->msgid == msgid) break; } if (op == NULL) { DEBUG(2, ("Unmatched msgid, discarding message (type: %0x)\n", msgtype)); ldap_msgfree(msg); return; } /* shouldn't happen */ if (op->done) { DEBUG(2, ("Operation [%p] already handled (type: %0x)\n", op, msgtype)); ldap_msgfree(msg); return; } switch (msgtype) { case LDAP_RES_SEARCH_ENTRY: /* go and process entry */ break; case LDAP_RES_SEARCH_REFERENCE: /* more ops to come with this msgid */ /* just ignore */ ldap_msgfree(msg); return; case LDAP_RES_BIND: case LDAP_RES_SEARCH_RESULT: case LDAP_RES_MODIFY: case LDAP_RES_ADD: case LDAP_RES_DELETE: case LDAP_RES_MODDN: case LDAP_RES_COMPARE: case LDAP_RES_EXTENDED: case LDAP_RES_INTERMEDIATE: /* no more results expected with this msgid */ op->done = true; break; default: /* unkwon msg type ?? */ DEBUG(1, ("Couldn't figure out the msg type! [%0x]\n", msgtype)); ldap_msgfree(msg); return; } reply = talloc_zero(op, struct sdap_msg); if (!reply) { ldap_msgfree(msg); ret = ENOMEM; } else { reply->msg = msg; ret = sdap_msg_attach(reply, msg); if (ret != EOK) { ldap_msgfree(msg); talloc_zfree(reply); } } if (op->list) { /* list exist, queue it */ op->last->next = reply; op->last = reply; } else { /* create list, then call callback */ op->list = op->last = reply; /* must be the last operation as it may end up freeing all memory * including all ops handlers */ op->callback(op, reply, ret, op->data); } } static void sdap_unlock_next_reply(struct sdap_op *op) { struct timeval tv; struct tevent_timer *te; struct sdap_msg *next_reply; if (op->list) { next_reply = op->list->next; /* get rid of the previous reply, it has been processed already */ talloc_zfree(op->list); op->list = next_reply; } /* if there are still replies to parse, queue a new operation */ if (op->list) { /* use a very small timeout, so that fd operations have a chance to be * served while processing a long reply */ tv = tevent_timeval_current(); /* wait 5 microsecond */ tv.tv_usec += 5; tv.tv_sec += tv.tv_usec / 1000000; tv.tv_usec = tv.tv_usec % 1000000; te = tevent_add_timer(op->ev, op, tv, sdap_process_next_reply, op); if (!te) { DEBUG(1, ("Failed to add critical timer for next reply!\n")); op->callback(op, NULL, EFAULT, op->data); } } } static void sdap_process_next_reply(struct tevent_context *ev, struct tevent_timer *te, struct timeval tv, void *pvt) { struct sdap_op *op = talloc_get_type(pvt, struct sdap_op); op->callback(op, op->list, EOK, op->data); } /* ==LDAP-Operations-Helpers============================================== */ static int sdap_op_destructor(void *mem) { struct sdap_op *op = (struct sdap_op *)mem; DLIST_REMOVE(op->sh->ops, op); if (op->done) return 0; /* we don't check the result here, if a message was really abandoned, * hopefully the server will get an abandon. * If the operation was already fully completed, this is going to be * just a noop */ ldap_abandon_ext(op->sh->ldap, op->msgid, NULL, NULL); return 0; } static void sdap_op_timeout(struct tevent_req *req) { struct sdap_op *op = tevent_req_callback_data(req, struct sdap_op); /* should never happen, but just in case */ if (op->done) { DEBUG(2, ("Timeout happened after op was finished !?\n")); return; } /* signal the caller that we have a timeout */ op->callback(op, NULL, ETIMEDOUT, op->data); } int sdap_op_add(TALLOC_CTX *memctx, struct tevent_context *ev, struct sdap_handle *sh, int msgid, sdap_op_callback_t *callback, void *data, int timeout, struct sdap_op **_op) { struct sdap_op *op; op = talloc_zero(memctx, struct sdap_op); if (!op) return ENOMEM; op->sh = sh; op->msgid = msgid; op->callback = callback; op->data = data; op->ev = ev; /* check if we need to set a timeout */ if (timeout) { struct tevent_req *req; struct timeval tv; tv = tevent_timeval_current(); tv = tevent_timeval_add(&tv, timeout, 0); /* allocate on op, so when it get freed the timeout is removed */ req = tevent_wakeup_send(op, ev, tv); if (!req) { talloc_zfree(op); return ENOMEM; } tevent_req_set_callback(req, sdap_op_timeout, op); } DLIST_ADD(sh->ops, op); talloc_set_destructor((TALLOC_CTX *)op, sdap_op_destructor); *_op = op; return EOK; } /* ==Modify-Password====================================================== */ struct sdap_exop_modify_passwd_state { struct sdap_handle *sh; struct sdap_op *op; int result; char *user_error_message; }; static void sdap_exop_modify_passwd_done(struct sdap_op *op, struct sdap_msg *reply, int error, void *pvt); struct tevent_req *sdap_exop_modify_passwd_send(TALLOC_CTX *memctx, struct tevent_context *ev, struct sdap_handle *sh, char *user_dn, char *password, char *new_password) { struct tevent_req *req = NULL; struct sdap_exop_modify_passwd_state *state; int ret; BerElement *ber = NULL; struct berval *bv = NULL; int msgid; LDAPControl *request_controls[2]; req = tevent_req_create(memctx, &state, struct sdap_exop_modify_passwd_state); if (!req) return NULL; state->sh = sh; state->user_error_message = NULL; ber = ber_alloc_t( LBER_USE_DER ); if (ber == NULL) { DEBUG(7, ("ber_alloc_t failed.\n")); talloc_zfree(req); return NULL; } ret = ber_printf( ber, "{tststs}", LDAP_TAG_EXOP_MODIFY_PASSWD_ID, user_dn, LDAP_TAG_EXOP_MODIFY_PASSWD_OLD, password, LDAP_TAG_EXOP_MODIFY_PASSWD_NEW, new_password); if (ret == -1) { DEBUG(1, ("ber_printf failed.\n")); ber_free(ber, 1); talloc_zfree(req); return NULL; } ret = ber_flatten(ber, &bv); ber_free(ber, 1); if (ret == -1) { DEBUG(1, ("ber_flatten failed.\n")); talloc_zfree(req); return NULL; } ret = sss_ldap_control_create(LDAP_CONTROL_PASSWORDPOLICYREQUEST, 0, NULL, 0, &request_controls[0]); if (ret != LDAP_SUCCESS) { DEBUG(1, ("sss_ldap_control_create failed.\n")); goto fail; } request_controls[1] = NULL; DEBUG(4, ("Executing extended operation\n")); ret = ldap_extended_operation(state->sh->ldap, LDAP_EXOP_MODIFY_PASSWD, bv, request_controls, NULL, &msgid); ber_bvfree(bv); ldap_control_free(request_controls[0]); if (ret == -1 || msgid == -1) { DEBUG(1, ("ldap_extended_operation failed\n")); goto fail; } DEBUG(8, ("ldap_extended_operation sent, msgid = %d\n", msgid)); /* FIXME: get timeouts from configuration, for now 5 secs. */ ret = sdap_op_add(state, ev, state->sh, msgid, sdap_exop_modify_passwd_done, req, 5, &state->op); if (ret) { DEBUG(1, ("Failed to set up operation!\n")); goto fail; } return req; fail: tevent_req_error(req, EIO); tevent_req_post(req, ev); return req; } static void sdap_exop_modify_passwd_done(struct sdap_op *op, struct sdap_msg *reply, int error, void *pvt) { struct tevent_req *req = talloc_get_type(pvt, struct tevent_req); struct sdap_exop_modify_passwd_state *state = tevent_req_data(req, struct sdap_exop_modify_passwd_state); char *errmsg = NULL; int ret; LDAPControl **response_controls = NULL; int c; ber_int_t pp_grace; ber_int_t pp_expire; LDAPPasswordPolicyError pp_error; if (error) { tevent_req_error(req, error); return; } ret = ldap_parse_result(state->sh->ldap, reply->msg, &state->result, NULL, &errmsg, NULL, &response_controls, 0); if (ret != LDAP_SUCCESS) { DEBUG(2, ("ldap_parse_result failed (%d)\n", state->op->msgid)); ret = EIO; goto done; } if (response_controls == NULL) { DEBUG(5, ("Server returned no controls.\n")); } else { for (c = 0; response_controls[c] != NULL; c++) { DEBUG(9, ("Server returned control [%s].\n", response_controls[c]->ldctl_oid)); if (strcmp(response_controls[c]->ldctl_oid, LDAP_CONTROL_PASSWORDPOLICYRESPONSE) == 0) { ret = ldap_parse_passwordpolicy_control(state->sh->ldap, response_controls[c], &pp_expire, &pp_grace, &pp_error); if (ret != LDAP_SUCCESS) { DEBUG(1, ("ldap_parse_passwordpolicy_control failed.\n")); ret = EIO; goto done; } DEBUG(7, ("Password Policy Response: expire [%d] grace [%d] " "error [%s].\n", pp_expire, pp_grace, ldap_passwordpolicy_err2txt(pp_error))); } } } if (state->result != LDAP_SUCCESS) { state->user_error_message = talloc_strdup(state, errmsg); if (state->user_error_message == NULL) { DEBUG(1, ("talloc_strdup failed.\n")); } } DEBUG(3, ("ldap_extended_operation result: %s(%d), %s\n", ldap_err2string(state->result), state->result, errmsg)); ret = LDAP_SUCCESS; done: ldap_controls_free(response_controls); ldap_memfree(errmsg); if (ret == LDAP_SUCCESS) { tevent_req_done(req); } else { tevent_req_error(req, ret); } } int sdap_exop_modify_passwd_recv(struct tevent_req *req, TALLOC_CTX * mem_ctx, enum sdap_result *result, char **user_error_message) { struct sdap_exop_modify_passwd_state *state = tevent_req_data(req, struct sdap_exop_modify_passwd_state); *result = SDAP_ERROR; *user_error_message = talloc_steal(mem_ctx, state->user_error_message); TEVENT_REQ_RETURN_ON_ERROR(req); if (state->result == LDAP_SUCCESS) { *result = SDAP_SUCCESS; } return EOK; } /* ==Fetch-RootDSE============================================= */ struct sdap_get_rootdse_state { struct tevent_context *ev; struct sdap_options *opts; struct sdap_handle *sh; struct sysdb_attrs *rootdse; }; static void sdap_get_rootdse_done(struct tevent_req *subreq); struct tevent_req *sdap_get_rootdse_send(TALLOC_CTX *memctx, struct tevent_context *ev, struct sdap_options *opts, struct sdap_handle *sh) { struct tevent_req *req, *subreq; struct sdap_get_rootdse_state *state; const char *attrs[] = { "*", "altServer", "namingContexts", "supportedControl", "supportedExtension", "supportedFeatures", "supportedLDAPVersion", "supportedSASLMechanisms", NULL }; DEBUG(9, ("Getting rootdse\n")); req = tevent_req_create(memctx, &state, struct sdap_get_rootdse_state); if (!req) return NULL; state->ev = ev; state->opts = opts; state->sh = sh; state->rootdse = NULL; subreq = sdap_get_generic_send(state, ev, opts, sh, "", LDAP_SCOPE_BASE, "(objectclass=*)", attrs, NULL, 0); if (!subreq) { talloc_zfree(req); return NULL; } tevent_req_set_callback(subreq, sdap_get_rootdse_done, req); return req; } static void sdap_get_rootdse_done(struct tevent_req *subreq) { struct tevent_req *req = tevent_req_callback_data(subreq, struct tevent_req); struct sdap_get_rootdse_state *state = tevent_req_data(req, struct sdap_get_rootdse_state); struct sysdb_attrs **results; size_t num_results; int ret; ret = sdap_get_generic_recv(subreq, state, &num_results, &results); talloc_zfree(subreq); if (ret) { tevent_req_error(req, ret); return; } if (num_results == 0 || !results) { DEBUG(2, ("RootDSE could not be retrieved. " "Please check that anonymous access to RootDSE is allowed\n" )); tevent_req_error(req, ENOENT); return; } if (num_results > 1) { DEBUG(2, ("Multiple replies when searching for RootDSE ??\n")); tevent_req_error(req, EIO); return; } state->rootdse = talloc_steal(state, results[0]); talloc_zfree(results); DEBUG(9, ("Got rootdse\n")); tevent_req_done(req); } int sdap_get_rootdse_recv(struct tevent_req *req, TALLOC_CTX *memctx, struct sysdb_attrs **rootdse) { struct sdap_get_rootdse_state *state = tevent_req_data(req, struct sdap_get_rootdse_state); TEVENT_REQ_RETURN_ON_ERROR(req); *rootdse = talloc_steal(memctx, state->rootdse); return EOK; } /* ==Generic Search============================================ */ struct sdap_get_generic_state { struct tevent_context *ev; struct sdap_options *opts; struct sdap_handle *sh; const char *search_base; int scope; const char *filter; const char **attrs; struct sdap_attr_map *map; int map_num_attrs; struct sdap_op *op; size_t reply_max; size_t reply_count; struct sysdb_attrs **reply; }; static errno_t add_to_reply(struct sdap_get_generic_state *state, struct sysdb_attrs *msg); static void sdap_get_generic_done(struct sdap_op *op, struct sdap_msg *reply, int error, void *pvt); struct tevent_req *sdap_get_generic_send(TALLOC_CTX *memctx, struct tevent_context *ev, struct sdap_options *opts, struct sdap_handle *sh, const char *search_base, int scope, const char *filter, const char **attrs, struct sdap_attr_map *map, int map_num_attrs) { struct tevent_req *req = NULL; struct sdap_get_generic_state *state = NULL; int lret; int ret; int msgid; req = tevent_req_create(memctx, &state, struct sdap_get_generic_state); if (!req) return NULL; state->ev = ev; state->opts = opts; state->sh = sh; state->search_base = search_base; state->scope = scope; state->filter = filter; state->attrs = attrs; state->map = map; state->map_num_attrs = map_num_attrs; state->op = NULL; state->reply_max = 0; state->reply_count = 0; state->reply = NULL; DEBUG(6, ("calling ldap_search_ext with [%s][%s].\n", state->filter, state->search_base)); if (debug_level >= 7) { int i; if (state->attrs) { for (i = 0; state->attrs[i]; i++) { DEBUG(7, ("Requesting attrs: [%s]\n", state->attrs[i])); } } } lret = ldap_search_ext(state->sh->ldap, state->search_base, state->scope, state->filter, discard_const(state->attrs), false, NULL, NULL, NULL, 0, &msgid); if (lret != LDAP_SUCCESS) { DEBUG(3, ("ldap_search_ext failed: %s\n", ldap_err2string(lret))); if (lret == LDAP_SERVER_DOWN) { ret = ETIMEDOUT; } else { ret = EIO; } goto fail; } DEBUG(8, ("ldap_search_ext called, msgid = %d\n", msgid)); ret = sdap_op_add(state, state->ev, state->sh, msgid, sdap_get_generic_done, req, dp_opt_get_int(state->opts->basic, SDAP_SEARCH_TIMEOUT), &state->op); if (ret != EOK) { DEBUG(1, ("Failed to set up operation!\n")); goto fail; } return req; fail: tevent_req_error(req, ret); tevent_req_post(req, ev); return req; } static void sdap_get_generic_done(struct sdap_op *op, struct sdap_msg *reply, int error, void *pvt) { struct tevent_req *req = talloc_get_type(pvt, struct tevent_req); struct sdap_get_generic_state *state = tevent_req_data(req, struct sdap_get_generic_state); struct sysdb_attrs *attrs; char *errmsg; int result; int ret; if (error) { tevent_req_error(req, error); return; } switch (ldap_msgtype(reply->msg)) { case LDAP_RES_SEARCH_REFERENCE: /* ignore references for now */ talloc_free(reply); /* unlock the operation so that we can proceed with the next result */ sdap_unlock_next_reply(state->op); break; case LDAP_RES_SEARCH_ENTRY: ret = sdap_parse_entry(state, state->sh, reply, state->map, state->map_num_attrs, &attrs, NULL); if (ret != EOK) { DEBUG(1, ("sdap_parse_generic_entry failed.\n")); tevent_req_error(req, ENOMEM); return; } ret = add_to_reply(state, attrs); if (ret != EOK) { DEBUG(1, ("add_to_reply failed.\n")); tevent_req_error(req, ret); return; } sdap_unlock_next_reply(state->op); break; case LDAP_RES_SEARCH_RESULT: ret = ldap_parse_result(state->sh->ldap, reply->msg, &result, NULL, &errmsg, NULL, NULL, 0); if (ret != LDAP_SUCCESS) { DEBUG(2, ("ldap_parse_result failed (%d)\n", state->op->msgid)); tevent_req_error(req, EIO); return; } DEBUG(6, ("Search result: %s(%d), %s\n", ldap_err2string(result), result, errmsg)); if (result != LDAP_SUCCESS && result != LDAP_NO_SUCH_OBJECT) { DEBUG(2, ("Unexpected result from ldap: %s(%d), %s\n", ldap_err2string(result), result, errmsg)); } tevent_req_done(req); return; default: /* what is going on here !? */ tevent_req_error(req, EIO); return; } } static errno_t add_to_reply(struct sdap_get_generic_state *state, struct sysdb_attrs *msg) { if (state->reply == NULL || state->reply_max == state->reply_count) { state->reply_max += REPLY_REALLOC_INCREMENT; state->reply = talloc_realloc(state, state->reply, struct sysdb_attrs *, state->reply_max); if (state->reply == NULL) { DEBUG(1, ("talloc_realloc failed.\n")); return ENOMEM; } } state->reply[state->reply_count++] = talloc_steal(state->reply, msg); return EOK; } int sdap_get_generic_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx, size_t *reply_count, struct sysdb_attrs ***reply) { struct sdap_get_generic_state *state = tevent_req_data(req, struct sdap_get_generic_state); TEVENT_REQ_RETURN_ON_ERROR(req); *reply_count = state->reply_count; *reply = talloc_steal(mem_ctx, state->reply); return EOK; }