/* $NetBSD: dlz_ldap_dynamic.c,v 1.3.4.1 2024/02/29 12:33:09 martin Exp $ */ /* * Copyright (C) Internet Systems Consortium, Inc. ("ISC") * * SPDX-License-Identifier: MPL-2.0 and ISC * * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, you can obtain one at https://mozilla.org/MPL/2.0/. */ /* * Copyright (C) 2002 Stichting NLnet, Netherlands, stichting@nlnet.nl. * * The development of Dynamically Loadable Zones (DLZ) for Bind 9 was * conceived and contributed by Rob Butler. * * Permission to use, copy, modify, and distribute this software for any purpose * with or without fee is hereby granted, provided that the above copyright * notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR * PERFORMANCE OF THIS SOFTWARE. */ /* * This provides the externally loadable ldap DLZ module, without * update support */ #include #include #include #include #include #include #include #include #include /* * Need older API functions from ldap.h. */ #define LDAP_DEPRECATED 1 #include #define SIMPLE "simple" #define KRB41 "krb41" #define KRB42 "krb42" #define V2 "v2" #define V3 "v3" #define dbc_search_limit 30 #define ALLNODES 1 #define ALLOWXFR 2 #define AUTHORITY 3 #define FINDZONE 4 #define LOOKUP 5 /*% * Structure to hold everything needed by this "instance" of the LDAP * driver remember, the driver code is only loaded once, but may have * many separate instances. */ typedef struct { db_list_t *db; /*%< handle to a list of DB */ int method; /*%< security authentication * method */ char *user; /*%< who is authenticating */ char *cred; /*%< password for simple * authentication method */ int protocol; /*%< LDAP communication * protocol version */ char *hosts; /*%< LDAP server hosts */ /* Helper functions from the dlz_dlopen driver */ log_t *log; dns_sdlz_putrr_t *putrr; dns_sdlz_putnamedrr_t *putnamedrr; dns_dlz_writeablezone_t *writeable_zone; } ldap_instance_t; /* forward references */ #if DLZ_DLOPEN_VERSION < 3 isc_result_t dlz_findzonedb(void *dbdata, const char *name); #else /* if DLZ_DLOPEN_VERSION < 3 */ isc_result_t dlz_findzonedb(void *dbdata, const char *name, dns_clientinfomethods_t *methods, dns_clientinfo_t *clientinfo); #endif /* if DLZ_DLOPEN_VERSION < 3 */ void dlz_destroy(void *dbdata); static void b9_add_helper(ldap_instance_t *db, const char *helper_name, void *ptr); /* * Private methods */ /*% checks that the LDAP URL parameters make sense */ static isc_result_t dlz_ldap_checkURL(ldap_instance_t *db, char *URL, int attrCnt, const char *msg) { isc_result_t result = ISC_R_SUCCESS; int ldap_result; LDAPURLDesc *ldap_url = NULL; if (!ldap_is_ldap_url(URL)) { db->log(ISC_LOG_ERROR, "%s query is not a valid LDAP URL", msg); result = ISC_R_FAILURE; goto cleanup; } ldap_result = ldap_url_parse(URL, &ldap_url); if (ldap_result != LDAP_SUCCESS || ldap_url == NULL) { db->log(ISC_LOG_ERROR, "parsing %s query failed", msg); result = ISC_R_FAILURE; goto cleanup; } if (ldap_count_values(ldap_url->lud_attrs) < attrCnt) { db->log(ISC_LOG_ERROR, "%s query must specify at least " "%d attributes to return", msg, attrCnt); result = ISC_R_FAILURE; goto cleanup; } if (ldap_url->lud_host != NULL) { db->log(ISC_LOG_ERROR, "%s query must not specify a host", msg); result = ISC_R_FAILURE; goto cleanup; } if (ldap_url->lud_port != 389) { db->log(ISC_LOG_ERROR, "%s query must not specify a port", msg); result = ISC_R_FAILURE; goto cleanup; } if (ldap_url->lud_dn == NULL || strlen(ldap_url->lud_dn) < 1) { db->log(ISC_LOG_ERROR, "%s query must specify a search base", msg); result = ISC_R_FAILURE; goto cleanup; } if (ldap_url->lud_exts != NULL || ldap_url->lud_crit_exts != 0) { db->log(ISC_LOG_ERROR, "%s uses extensions. " "The driver does not support LDAP extensions.", msg); result = ISC_R_FAILURE; goto cleanup; } cleanup: if (ldap_url != NULL) { ldap_free_urldesc(ldap_url); } return (result); } /*% Connects / reconnects to LDAP server */ static isc_result_t dlz_ldap_connect(ldap_instance_t *dbi, dbinstance_t *dbc) { isc_result_t result; int ldap_result; /* if we have a connection, get ride of it. */ if (dbc->dbconn != NULL) { ldap_unbind_s((LDAP *)dbc->dbconn); dbc->dbconn = NULL; } /* now connect / reconnect. */ /* initialize. */ dbc->dbconn = ldap_init(dbi->hosts, LDAP_PORT); if (dbc->dbconn == NULL) { return (ISC_R_NOMEMORY); } /* set protocol version. */ ldap_result = ldap_set_option((LDAP *)dbc->dbconn, LDAP_OPT_PROTOCOL_VERSION, &(dbi->protocol)); if (ldap_result != LDAP_SUCCESS) { result = ISC_R_NOPERM; goto cleanup; } /* "bind" to server. i.e. send username / pass */ ldap_result = ldap_bind_s((LDAP *)dbc->dbconn, dbi->user, dbi->cred, dbi->method); if (ldap_result != LDAP_SUCCESS) { result = ISC_R_FAILURE; goto cleanup; } return (ISC_R_SUCCESS); cleanup: /* cleanup if failure. */ if (dbc->dbconn != NULL) { ldap_unbind_s((LDAP *)dbc->dbconn); dbc->dbconn = NULL; } return (result); } /*% * Properly cleans up a list of database instances. * This function is only used when the driver is compiled for * multithreaded operation. */ static void dlz_ldap_destroy_dblist(db_list_t *dblist) { dbinstance_t *ndbi = NULL; dbinstance_t *dbi = NULL; /* get the first DBI in the list */ ndbi = DLZ_LIST_HEAD(*dblist); /* loop through the list */ while (ndbi != NULL) { dbi = ndbi; /* get the next DBI in the list */ ndbi = DLZ_LIST_NEXT(dbi, link); /* release DB connection */ if (dbi->dbconn != NULL) { ldap_unbind_s((LDAP *)dbi->dbconn); } /* release all memory that comprised a DBI */ destroy_dbinstance(dbi); } /* release memory for the list structure */ free(dblist); } /*% * Loops through the list of DB instances, attempting to lock * on the mutex. If successful, the DBI is reserved for use * and the thread can perform queries against the database. * If the lock fails, the next one in the list is tried. * looping continues until a lock is obtained, or until * the list has been searched dbc_search_limit times. * This function is only used when the driver is compiled for * multithreaded operation. */ static dbinstance_t * dlz_ldap_find_avail_conn(ldap_instance_t *ldap) { dbinstance_t *dbi = NULL; dbinstance_t *head; int count = 0; /* get top of list */ head = dbi = DLZ_LIST_HEAD(*ldap->db); /* loop through list */ while (count < dbc_search_limit) { /* try to lock on the mutex */ if (dlz_mutex_trylock(&dbi->lock) == 0) { return (dbi); /* success, return the DBI for use. */ } /* not successful, keep trying */ dbi = DLZ_LIST_NEXT(dbi, link); /* check to see if we have gone to the top of the list. */ if (dbi == NULL) { count++; dbi = head; } } ldap->log(ISC_LOG_INFO, "LDAP driver unable to find available connection " "after searching %d times", count); return (NULL); } static isc_result_t dlz_ldap_process_results(ldap_instance_t *db, LDAP *dbc, LDAPMessage *msg, char **attrs, void *ptr, bool allnodes) { isc_result_t result = ISC_R_SUCCESS; int i = 0; int j; int len; char *attribute = NULL; LDAPMessage *entry; char *endp = NULL; char *host = NULL; char *type = NULL; char *data = NULL; char **vals = NULL; int ttl; /* get the first entry to process */ entry = ldap_first_entry(dbc, msg); if (entry == NULL) { db->log(ISC_LOG_INFO, "LDAP no entries to process."); return (ISC_R_FAILURE); } /* loop through all entries returned */ while (entry != NULL) { /* reset for this loop */ ttl = 0; len = 0; i = 0; attribute = attrs[i]; /* determine how much space we need for data string */ for (j = 0; attrs[j] != NULL; j++) { /* get the list of values for this attribute. */ vals = ldap_get_values(dbc, entry, attrs[j]); /* skip empty attributes. */ if (vals == NULL || ldap_count_values(vals) < 1) { continue; } /* * we only use the first value. this driver * does not support multi-valued attributes. */ len = len + strlen(vals[0]) + 1; /* free vals for next loop */ ldap_value_free(vals); } /* allocate memory for data string */ data = malloc(len + 1); if (data == NULL) { db->log(ISC_LOG_ERROR, "LDAP driver unable to allocate " "memory " "while processing results"); result = ISC_R_FAILURE; goto cleanup; } /* * Make sure data is null termed at the beginning so * we can check if any data was stored to it later. */ data[0] = '\0'; /* reset j to re-use below */ j = 0; /* loop through the attributes in the order specified. */ while (attribute != NULL) { /* get the list of values for this attribute. */ vals = ldap_get_values(dbc, entry, attribute); /* skip empty attributes. */ if (vals == NULL || vals[0] == NULL) { /* increment attribute pointer */ attribute = attrs[++i]; /* start loop over */ continue; } /* * j initially = 0. Increment j each time we * set a field that way next loop will set * next field. */ switch (j) { case 0: j++; /* * convert text to int, make sure it * worked right */ ttl = strtol(vals[0], &endp, 10); if (*endp != '\0' || ttl < 0) { db->log(ISC_LOG_ERROR, "LDAP driver " "ttl must " "be a positive " "number"); goto cleanup; } break; case 1: j++; type = strdup(vals[0]); break; case 2: j++; if (allnodes) { host = strdup(vals[0]); } else { strcpy(data, vals[0]); } break; case 3: j++; if (allnodes) { strcpy(data, vals[0]); } else { strcat(data, " "); strcat(data, vals[0]); } break; default: strcat(data, " "); strcat(data, vals[0]); break; } /* free values */ ldap_value_free(vals); vals = NULL; /* increment attribute pointer */ attribute = attrs[++i]; } if (type == NULL) { db->log(ISC_LOG_ERROR, "LDAP driver unable to retrieve " "DNS type"); result = ISC_R_FAILURE; goto cleanup; } if (strlen(data) < 1) { db->log(ISC_LOG_ERROR, "LDAP driver unable to retrieve " "DNS data"); result = ISC_R_FAILURE; goto cleanup; } if (allnodes && host != NULL) { dns_sdlzallnodes_t *an = (dns_sdlzallnodes_t *)ptr; if (strcasecmp(host, "~") == 0) { result = db->putnamedrr(an, "*", type, ttl, data); } else { result = db->putnamedrr(an, host, type, ttl, data); } if (result != ISC_R_SUCCESS) { db->log(ISC_LOG_ERROR, "ldap_dynamic: putnamedrr failed " "for \"%s %s %u %s\" (%d)", host, type, ttl, data, result); } } else { dns_sdlzlookup_t *lookup = (dns_sdlzlookup_t *)ptr; result = db->putrr(lookup, type, ttl, data); if (result != ISC_R_SUCCESS) { db->log(ISC_LOG_ERROR, "ldap_dynamic: putrr failed " "for \"%s %u %s\" (%s)", type, ttl, data, result); } } if (result != ISC_R_SUCCESS) { db->log(ISC_LOG_ERROR, "LDAP driver failed " "while sending data to BIND."); goto cleanup; } /* free memory for type, data and host for next loop */ free(type); type = NULL; free(data); data = NULL; if (host != NULL) { free(host); host = NULL; } /* get the next entry to process */ entry = ldap_next_entry(dbc, entry); } cleanup: /* de-allocate memory */ if (vals != NULL) { ldap_value_free(vals); } if (host != NULL) { free(host); } if (type != NULL) { free(type); } if (data != NULL) { free(data); } return (result); } /*% * This function is the real core of the driver. Zone, record * and client strings are passed in (or NULL is passed if the * string is not available). The type of query we want to run * is indicated by the query flag, and the dbdata object is passed * passed in to. dbdata really holds either: * 1) a list of database instances (in multithreaded mode) OR * 2) a single database instance (in single threaded mode) * The function will construct the query and obtain an available * database instance (DBI). It will then run the query and hopefully * obtain a result set. */ static isc_result_t dlz_ldap_get_results(const char *zone, const char *record, const char *client, unsigned int query, void *dbdata, void *ptr) { isc_result_t result; ldap_instance_t *db = (ldap_instance_t *)dbdata; dbinstance_t *dbi = NULL; char *querystring = NULL; LDAPURLDesc *ldap_url = NULL; int ldap_result = 0; LDAPMessage *ldap_msg = NULL; int i; int entries; /* get db instance / connection */ /* find an available DBI from the list */ dbi = dlz_ldap_find_avail_conn(db); /* if DBI is null, can't do anything else */ if (dbi == NULL) { return (ISC_R_FAILURE); } /* set fields */ if (zone != NULL) { dbi->zone = strdup(zone); if (dbi->zone == NULL) { result = ISC_R_NOMEMORY; goto cleanup; } } else { dbi->zone = NULL; } if (record != NULL) { dbi->record = strdup(record); if (dbi->record == NULL) { result = ISC_R_NOMEMORY; goto cleanup; } } else { dbi->record = NULL; } if (client != NULL) { dbi->client = strdup(client); if (dbi->client == NULL) { result = ISC_R_NOMEMORY; goto cleanup; } } else { dbi->client = NULL; } /* what type of query are we going to run? */ switch (query) { case ALLNODES: /* * if the query was not passed in from the config file * then we can't run it. return not_implemented, so * it's like the code for that operation was never * built into the driver.... AHHH flexibility!!! */ if (dbi->allnodes_q == NULL) { result = ISC_R_NOTIMPLEMENTED; goto cleanup; } else { querystring = build_querystring(dbi->allnodes_q); } break; case ALLOWXFR: /* same as comments as ALLNODES */ if (dbi->allowxfr_q == NULL) { result = ISC_R_NOTIMPLEMENTED; goto cleanup; } else { querystring = build_querystring(dbi->allowxfr_q); } break; case AUTHORITY: /* same as comments as ALLNODES */ if (dbi->authority_q == NULL) { result = ISC_R_NOTIMPLEMENTED; goto cleanup; } else { querystring = build_querystring(dbi->authority_q); } break; case FINDZONE: /* this is required. It's the whole point of DLZ! */ if (dbi->findzone_q == NULL) { db->log(ISC_LOG_DEBUG(2), "No query specified for " "findzone. " "Findzone requires a query"); result = ISC_R_FAILURE; goto cleanup; } else { querystring = build_querystring(dbi->findzone_q); } break; case LOOKUP: /* this is required. It's also a major point of DLZ! */ if (dbi->lookup_q == NULL) { db->log(ISC_LOG_DEBUG(2), "No query specified for " "lookup. " "Lookup requires a query"); result = ISC_R_FAILURE; goto cleanup; } else { querystring = build_querystring(dbi->lookup_q); } break; default: /* * this should never happen. If it does, the code is * screwed up! */ db->log(ISC_LOG_ERROR, "Incorrect query flag passed to " "dlz_ldap_get_results"); result = ISC_R_UNEXPECTED; goto cleanup; } /* if the querystring is null, Bummer, outta RAM. UPGRADE TIME!!! */ if (querystring == NULL) { result = ISC_R_NOMEMORY; goto cleanup; } /* * output the full query string during debug so we can see * what lame error the query has. */ db->log(ISC_LOG_DEBUG(1), "Query String: %s", querystring); /* break URL down into it's component parts, if error cleanup */ ldap_result = ldap_url_parse(querystring, &ldap_url); if (ldap_result != LDAP_SUCCESS || ldap_url == NULL) { result = ISC_R_FAILURE; goto cleanup; } for (i = 0; i < 3; i++) { /* * dbi->dbconn may be null if trying to reconnect on a * previous query failed. */ if (dbi->dbconn == NULL) { db->log(ISC_LOG_INFO, "LDAP driver attempting to " "re-connect"); result = dlz_ldap_connect((ldap_instance_t *)dbdata, dbi); if (result != ISC_R_SUCCESS) { result = ISC_R_FAILURE; continue; } } /* perform ldap search synchronously */ ldap_result = ldap_search_s((LDAP *)dbi->dbconn, ldap_url->lud_dn, ldap_url->lud_scope, ldap_url->lud_filter, ldap_url->lud_attrs, 0, &ldap_msg); /* * check return code. No such object is ok, just * didn't find what we wanted */ switch (ldap_result) { case LDAP_NO_SUCH_OBJECT: db->log(ISC_LOG_DEBUG(1), "No object found matching " "query requirements"); result = ISC_R_NOTFOUND; goto cleanup; break; case LDAP_SUCCESS: /* on success do nothing */ result = ISC_R_SUCCESS; i = 3; break; case LDAP_SERVER_DOWN: db->log(ISC_LOG_INFO, "LDAP driver attempting to " "re-connect"); result = dlz_ldap_connect((ldap_instance_t *)dbdata, dbi); if (result != ISC_R_SUCCESS) { result = ISC_R_FAILURE; } break; default: /* * other errors not ok. Log error message and * get out */ db->log(ISC_LOG_ERROR, "LDAP error: %s", ldap_err2string(ldap_result)); result = ISC_R_FAILURE; goto cleanup; break; } } if (result != ISC_R_SUCCESS) { goto cleanup; } switch (query) { case ALLNODES: result = dlz_ldap_process_results(db, (LDAP *)dbi->dbconn, ldap_msg, ldap_url->lud_attrs, ptr, true); break; case AUTHORITY: case LOOKUP: result = dlz_ldap_process_results(db, (LDAP *)dbi->dbconn, ldap_msg, ldap_url->lud_attrs, ptr, false); break; case ALLOWXFR: entries = ldap_count_entries((LDAP *)dbi->dbconn, ldap_msg); if (entries == 0) { result = ISC_R_NOPERM; } else if (entries > 0) { result = ISC_R_SUCCESS; } else { result = ISC_R_FAILURE; } break; case FINDZONE: entries = ldap_count_entries((LDAP *)dbi->dbconn, ldap_msg); if (entries == 0) { result = ISC_R_NOTFOUND; } else if (entries > 0) { result = ISC_R_SUCCESS; } else { result = ISC_R_FAILURE; } break; default: /* * this should never happen. If it does, the code is * screwed up! */ db->log(ISC_LOG_ERROR, "Incorrect query flag passed to " "dlz_ldap_get_results"); result = ISC_R_UNEXPECTED; } cleanup: /* it's always good to cleanup after yourself */ /* if we retrieved results, free them */ if (ldap_msg != NULL) { ldap_msgfree(ldap_msg); } if (ldap_url != NULL) { ldap_free_urldesc(ldap_url); } /* cleanup */ if (dbi->zone != NULL) { free(dbi->zone); } if (dbi->record != NULL) { free(dbi->record); } if (dbi->client != NULL) { free(dbi->client); } dbi->zone = dbi->record = dbi->client = NULL; /* release the lock so another thread can use this dbi */ (void)dlz_mutex_unlock(&dbi->lock); /* release query string */ if (querystring != NULL) { free(querystring); } /* return result */ return (result); } /* * DLZ methods */ isc_result_t dlz_allowzonexfr(void *dbdata, const char *name, const char *client) { isc_result_t result; /* check to see if we are authoritative for the zone first */ #if DLZ_DLOPEN_VERSION < 3 result = dlz_findzonedb(dbdata, name); #else /* if DLZ_DLOPEN_VERSION < 3 */ result = dlz_findzonedb(dbdata, name, NULL, NULL); #endif /* if DLZ_DLOPEN_VERSION < 3 */ if (result != ISC_R_SUCCESS) { return (result); } /* get all the zone data */ result = dlz_ldap_get_results(name, NULL, client, ALLOWXFR, dbdata, NULL); return (result); } isc_result_t dlz_allnodes(const char *zone, void *dbdata, dns_sdlzallnodes_t *allnodes) { return (dlz_ldap_get_results(zone, NULL, NULL, ALLNODES, dbdata, allnodes)); } isc_result_t dlz_authority(const char *zone, void *dbdata, dns_sdlzlookup_t *lookup) { return (dlz_ldap_get_results(zone, NULL, NULL, AUTHORITY, dbdata, lookup)); } #if DLZ_DLOPEN_VERSION < 3 isc_result_t dlz_findzonedb(void *dbdata, const char *name) #else /* if DLZ_DLOPEN_VERSION < 3 */ isc_result_t dlz_findzonedb(void *dbdata, const char *name, dns_clientinfomethods_t *methods, dns_clientinfo_t *clientinfo) #endif /* if DLZ_DLOPEN_VERSION < 3 */ { #if DLZ_DLOPEN_VERSION >= 3 UNUSED(methods); UNUSED(clientinfo); #endif /* if DLZ_DLOPEN_VERSION >= 3 */ return (dlz_ldap_get_results(name, NULL, NULL, FINDZONE, dbdata, NULL)); } #if DLZ_DLOPEN_VERSION == 1 isc_result_t dlz_lookup(const char *zone, const char *name, void *dbdata, dns_sdlzlookup_t *lookup) #else /* if DLZ_DLOPEN_VERSION == 1 */ isc_result_t dlz_lookup(const char *zone, const char *name, void *dbdata, dns_sdlzlookup_t *lookup, dns_clientinfomethods_t *methods, dns_clientinfo_t *clientinfo) #endif /* if DLZ_DLOPEN_VERSION == 1 */ { isc_result_t result; #if DLZ_DLOPEN_VERSION >= 2 UNUSED(methods); UNUSED(clientinfo); #endif /* if DLZ_DLOPEN_VERSION >= 2 */ if (strcmp(name, "*") == 0) { result = dlz_ldap_get_results(zone, "~", NULL, LOOKUP, dbdata, lookup); } else { result = dlz_ldap_get_results(zone, name, NULL, LOOKUP, dbdata, lookup); } return (result); } isc_result_t dlz_create(const char *dlzname, unsigned int argc, char *argv[], void **dbdata, ...) { isc_result_t result = ISC_R_FAILURE; ldap_instance_t *ldap = NULL; dbinstance_t *dbi = NULL; const char *helper_name = NULL; int protocol, method, dbcount, i; char *endp = NULL; va_list ap; UNUSED(dlzname); /* allocate memory for LDAP instance */ ldap = calloc(1, sizeof(ldap_instance_t)); if (ldap == NULL) { return (ISC_R_NOMEMORY); } memset(ldap, 0, sizeof(ldap_instance_t)); /* Fill in the helper functions */ va_start(ap, dbdata); while ((helper_name = va_arg(ap, const char *)) != NULL) { b9_add_helper(ldap, helper_name, va_arg(ap, void *)); } va_end(ap); /* if debugging, let user know we are multithreaded. */ ldap->log(ISC_LOG_DEBUG(1), "LDAP driver running multithreaded"); if (argc < 9) { ldap->log(ISC_LOG_ERROR, "LDAP driver requires at least " "8 command line args."); goto cleanup; } /* no more than 13 arg's should be passed to the driver */ if (argc > 12) { ldap->log(ISC_LOG_ERROR, "LDAP driver cannot accept more than " "11 command line args."); goto cleanup; } /* determine protocol version. */ if (strncasecmp(argv[2], V2, strlen(V2)) == 0) { protocol = 2; } else if (strncasecmp(argv[2], V3, strlen(V3)) == 0) { protocol = 3; } else { ldap->log(ISC_LOG_ERROR, "LDAP driver protocol must be either %s or %s", V2, V3); goto cleanup; } /* determine connection method. */ if (strncasecmp(argv[3], SIMPLE, strlen(SIMPLE)) == 0) { method = LDAP_AUTH_SIMPLE; } else if (strncasecmp(argv[3], KRB41, strlen(KRB41)) == 0) { method = LDAP_AUTH_KRBV41; } else if (strncasecmp(argv[3], KRB42, strlen(KRB42)) == 0) { method = LDAP_AUTH_KRBV42; } else { ldap->log(ISC_LOG_ERROR, "LDAP driver authentication method must be " "one of %s, %s or %s", SIMPLE, KRB41, KRB42); goto cleanup; } /* check how many db connections we should create */ dbcount = strtol(argv[1], &endp, 10); if (*endp != '\0' || dbcount < 0) { ldap->log(ISC_LOG_ERROR, "LDAP driver database connection " "count " "must be positive."); goto cleanup; } /* check that LDAP URL parameters make sense */ switch (argc) { case 12: result = dlz_ldap_checkURL(ldap, argv[11], 0, "allow zone transfer"); if (result != ISC_R_SUCCESS) { goto cleanup; } FALLTHROUGH; case 11: result = dlz_ldap_checkURL(ldap, argv[10], 3, "all nodes"); if (result != ISC_R_SUCCESS) { goto cleanup; } FALLTHROUGH; case 10: if (strlen(argv[9]) > 0) { result = dlz_ldap_checkURL(ldap, argv[9], 3, "authority"); if (result != ISC_R_SUCCESS) { goto cleanup; } } FALLTHROUGH; case 9: result = dlz_ldap_checkURL(ldap, argv[8], 3, "lookup"); if (result != ISC_R_SUCCESS) { goto cleanup; } result = dlz_ldap_checkURL(ldap, argv[7], 0, "find zone"); if (result != ISC_R_SUCCESS) { goto cleanup; } break; default: /* not really needed, should shut up compiler. */ result = ISC_R_FAILURE; } /* store info needed to automatically re-connect. */ ldap->protocol = protocol; ldap->method = method; ldap->hosts = strdup(argv[6]); if (ldap->hosts == NULL) { result = ISC_R_NOMEMORY; goto cleanup; } ldap->user = strdup(argv[4]); if (ldap->user == NULL) { result = ISC_R_NOMEMORY; goto cleanup; } ldap->cred = strdup(argv[5]); if (ldap->cred == NULL) { result = ISC_R_NOMEMORY; goto cleanup; } /* allocate memory for database connection list */ ldap->db = calloc(1, sizeof(db_list_t)); if (ldap->db == NULL) { result = ISC_R_NOMEMORY; goto cleanup; } /* initialize DB connection list */ DLZ_LIST_INIT(*(ldap->db)); /* * create the appropriate number of database instances (DBI) * append each new DBI to the end of the list */ for (i = 0; i < dbcount; i++) { /* how many queries were passed in from config file? */ switch (argc) { case 9: result = build_dbinstance(NULL, NULL, NULL, argv[7], argv[8], NULL, &dbi, ldap->log); break; case 10: result = build_dbinstance(NULL, NULL, argv[9], argv[7], argv[8], NULL, &dbi, ldap->log); break; case 11: result = build_dbinstance(argv[10], NULL, argv[9], argv[7], argv[8], NULL, &dbi, ldap->log); break; case 12: result = build_dbinstance(argv[10], argv[11], argv[9], argv[7], argv[8], NULL, &dbi, ldap->log); break; default: /* not really needed, should shut up compiler. */ result = ISC_R_FAILURE; } if (result == ISC_R_SUCCESS) { ldap->log(ISC_LOG_DEBUG(2), "LDAP driver created " "database instance " "object."); } else { /* unsuccessful?, log err msg and cleanup. */ ldap->log(ISC_LOG_ERROR, "LDAP driver could not create " "database instance object."); goto cleanup; } /* when multithreaded, build a list of DBI's */ DLZ_LINK_INIT(dbi, link); DLZ_LIST_APPEND(*(ldap->db), dbi, link); /* attempt to connect */ result = dlz_ldap_connect(ldap, dbi); /* * if db connection cannot be created, log err msg and * cleanup. */ switch (result) { /* success, do nothing */ case ISC_R_SUCCESS: break; /* * no memory means ldap_init could not * allocate memory */ case ISC_R_NOMEMORY: ldap->log(ISC_LOG_ERROR, "LDAP driver could not allocate memory " "for connection number %u", i + 1); goto cleanup; /* * no perm means ldap_set_option could not set * protocol version */ case ISC_R_NOPERM: ldap->log(ISC_LOG_ERROR, "LDAP driver could not " "set protocol version."); result = ISC_R_FAILURE; goto cleanup; /* failure means couldn't connect to ldap server */ case ISC_R_FAILURE: ldap->log(ISC_LOG_ERROR, "LDAP driver could not bind " "connection number %u to server.", i + 1); goto cleanup; /* * default should never happen. If it does, * major errors. */ default: ldap->log(ISC_LOG_ERROR, "dlz_create() failed (%d)", result); result = ISC_R_UNEXPECTED; goto cleanup; } /* set DBI = null for next loop through. */ dbi = NULL; } /* set dbdata to the ldap_instance we created. */ *dbdata = ldap; return (ISC_R_SUCCESS); cleanup: dlz_destroy(ldap); return (result); } void dlz_destroy(void *dbdata) { if (dbdata != NULL) { ldap_instance_t *db = (ldap_instance_t *)dbdata; /* cleanup the list of DBI's */ if (db->db != NULL) { dlz_ldap_destroy_dblist((db_list_t *)(db->db)); } if (db->hosts != NULL) { free(db->hosts); } if (db->user != NULL) { free(db->user); } if (db->cred != NULL) { free(db->cred); } free(dbdata); } } /* * Return the version of the API */ int dlz_version(unsigned int *flags) { *flags |= DNS_SDLZFLAG_RELATIVERDATA | DNS_SDLZFLAG_THREADSAFE; return (DLZ_DLOPEN_VERSION); } /* * Register a helper function from the bind9 dlz_dlopen driver */ static void b9_add_helper(ldap_instance_t *db, const char *helper_name, void *ptr) { if (strcmp(helper_name, "log") == 0) { db->log = (log_t *)ptr; } if (strcmp(helper_name, "putrr") == 0) { db->putrr = (dns_sdlz_putrr_t *)ptr; } if (strcmp(helper_name, "putnamedrr") == 0) { db->putnamedrr = (dns_sdlz_putnamedrr_t *)ptr; } if (strcmp(helper_name, "writeable_zone") == 0) { db->writeable_zone = (dns_dlz_writeablezone_t *)ptr; } }