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ngx_http_auth_ldap_module.c
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/**
* Copyright (C) 2011-2013 Valery Komarov <komarov@valerka.net>
* Copyright (C) 2013 Jiri Hruska <jirka@fud.cz>
* Copyright (C) 2015-2016 Victor Hahn Castell <victor.hahn@flexoptix.net>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
#include <ngx_md5.h>
#include <ldap.h>
#include <openssl/opensslv.h>
//#include <sys/socket.h>
// used for manual warnings
#define XSTR(x) STR(x)
#define STR(x) #x
// make sure manual warnings don't get escalated to errors
#ifdef __clang__
#pragma clang diagnostic warning "-W#warnings"
#else
#ifdef __GNUC__
#if GNUC > 4
#pragma GCC diagnostic warning "-Wcpp"
#endif
#endif
#endif
// TODO: do the same stuff for MSVC and/or other compilers
#ifndef LDAP_PROTO_EXT
/* Some OpenLDAP headers are accidentally missing ldap_init_fd() etc. */
#define LDAP_PROTO_TCP 1 /* ldap:// */
#define LDAP_PROTO_UDP 2 /* reserved */
#define LDAP_PROTO_IPC 3 /* ldapi:// */
#define LDAP_PROTO_EXT 4 /* user-defined socket/sockbuf */
extern int ldap_init_fd(ber_socket_t fd, int proto, const char *url, LDAP **ld);
#endif
#define OUTCOME_ERROR -1 /* Some error occured in the process */
#define OUTCOME_DENY 0
#define OUTCOME_ALLOW 1
#define OUTCOME_CACHED_DENY 2 /* Cached results */
#define OUTCOME_CACHED_ALLOW 3
#define OUTCOME_UNCERTAIN 4 /* Not yet decided */
#define NGX_HTTP_AUTH_LDAP_MAX_SERVERS_SIZE 7
#define SSL_CERT_VERIFY_OFF 0
#define SSL_CERT_VERIFY_FULL 1
#define SSL_CERT_VERIFY_CHAIN 2
#define LDAP_ATTR_HEADER_DEFAULT_PREFIX "X-LDAP-ATTR-"
#define SANITIZE_NO_CONV 0
#define SANITIZE_TO_UPPER 1
#define SANITIZE_TO_LOWER 2
#define ENCODING_TEXT 0
#define ENCODING_B64 1
#define ENCODING_HEX 2
#define DEFAULT_ATTRS_COUNT 3 /* The default number of search attributes */
#define MAX_ATTRS_COUNT 5 /* Maximum search attributes to display in log */
#define RECONNECT_ASAP_MS 1000 /* Delay (in ms) for LDAP reconnection (when we want ASAP reconnect) */
typedef struct {
LDAPURLDesc *ludpp;
ngx_str_t url;
ngx_url_t parsed_url;
ngx_str_t alias;
ngx_str_t bind_dn;
ngx_str_t bind_dn_passwd;
ngx_str_t group_attribute;
ngx_flag_t group_attribute_dn;
ngx_flag_t ssl_check_cert;
ngx_str_t ssl_ca_dir;
ngx_str_t ssl_ca_file;
ngx_array_t *require_group; /* array of ngx_http_complex_value_t */
ngx_array_t *require_user; /* array of ngx_http_complex_value_t */
ngx_flag_t require_valid_user;
ngx_http_complex_value_t require_valid_user_dn;
ngx_flag_t satisfy_all;
ngx_flag_t referral;
ngx_flag_t clean_on_timeout;
ngx_uint_t connections;
ngx_uint_t max_down_retries;
ngx_uint_t max_down_retries_count;
ngx_msec_t connect_timeout;
ngx_msec_t reconnect_timeout;
ngx_msec_t bind_timeout;
ngx_msec_t request_timeout;
ngx_queue_t free_connections; /* Queue of free (ready) connections */
ngx_queue_t waiting_requests; /* Queue of ctx with not finished requests */
ngx_queue_t pending_reconnections; /* Queue of pending connections (waiting re-connect) */
char **attrs; /* Search attributes formated for ldap_search_ext() */
ngx_str_t attribute_header_prefix;
} ngx_http_auth_ldap_server_t;
typedef struct {
ngx_array_t *servers; /* array of ngx_http_auth_ldap_server_t */
ngx_flag_t cache_enabled;
ngx_msec_t cache_expiration_time;
size_t cache_size;
ngx_int_t servers_size;
#if (NGX_OPENSSL)
ngx_ssl_t ssl;
#endif
ngx_msec_t resolver_timeout; /* resolver_timeout */
ngx_resolver_t *resolver; /* resolver */
ngx_pool_t *cnf_pool;
} ngx_http_auth_ldap_main_conf_t;
typedef struct {
ngx_str_t realm;
ngx_array_t *servers; /* array of ngx_http_auth_ldap_server_t* */
} ngx_http_auth_ldap_loc_conf_t;
typedef struct {
ngx_str_t attr_name;
ngx_str_t attr_value;
} ldap_search_attribute_t;
typedef struct {
uint32_t small_hash; /* murmur2 hash of username ^ &server */
uint32_t outcome; /* OUTCOME_DENY or OUTCOME_ALLOW */
ngx_msec_t time; /* ngx_current_msec when created */
u_char big_hash[16]; /* md5 hash of (username, server, password) */
ngx_array_t attributes; /* Attributes (ldap_search_attribute_t) retreived during the search */
} ngx_http_auth_ldap_cache_elt_t;
typedef struct {
ngx_http_auth_ldap_cache_elt_t *buckets;
ngx_uint_t num_buckets;
ngx_uint_t elts_per_bucket;
ngx_msec_t expiration_time;
ngx_pool_t *pool;
} ngx_http_auth_ldap_cache_t;
typedef enum {
PHASE_START,
PHASE_SEARCH,
PHASE_CHECK_USER,
PHASE_CHECK_GROUP,
PHASE_CHECK_BIND,
PHASE_REBIND,
PHASE_NEXT
} ngx_http_auth_ldap_request_phase_t;
typedef struct {
ngx_http_request_t *r;
ngx_uint_t server_index;
ngx_http_auth_ldap_server_t *server;
ngx_http_auth_ldap_request_phase_t phase;
unsigned int iteration;
int outcome;
ngx_array_t attributes; /* Attributes (ldap_search_attribute_t) retreived during the search */
struct ngx_http_auth_ldap_connection *c;
ngx_queue_t queue; /* Queue element to be chained in server->waiting_requests queue */
int replied;
int error_code;
ngx_str_t error_msg;
ngx_str_t dn;
ngx_str_t user_dn;
ngx_str_t group_dn;
ngx_http_auth_ldap_cache_elt_t *cache_bucket;
u_char cache_big_hash[16];
uint32_t cache_small_hash;
} ngx_http_auth_ldap_ctx_t;
typedef enum {
STATE_DISCONNECTED,
STATE_INITIAL_BINDING,
STATE_CONNECTING,
STATE_READY,
STATE_BINDING,
STATE_SEARCHING,
STATE_COMPARING,
STATE_DISCONNECTING
} ngx_http_auth_ldap_connection_state_t;
typedef struct ngx_http_auth_ldap_connection {
ngx_log_t *log;
ngx_http_auth_ldap_main_conf_t *main_cnf;
ngx_http_auth_ldap_server_t *server;
ngx_peer_connection_t conn;
ngx_event_t reconnect_event;
#if (NGX_OPENSSL)
ngx_pool_t *pool;
ngx_ssl_t *ssl;
#endif
ngx_queue_t queue; /* Queue element to be chained in server->free_connections queue */
ngx_queue_t queue_pending; /* Queue element to be chained in server->pending_reconnections queue */
ngx_http_auth_ldap_ctx_t *rctx;
LDAP* ld;
ngx_http_auth_ldap_connection_state_t state;
int msgid;
ngx_resolver_ctx_t *resolver_ctx;
ngx_uint_t cnx_idx; /* index of the connection from 0 to server->connections -1 */
} ngx_http_auth_ldap_connection_t;
static char * ngx_http_auth_ldap_ldap_server_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static char * ngx_http_auth_ldap_ldap_server(ngx_conf_t *cf, ngx_command_t *dummy, void *conf);
static char * ngx_http_auth_ldap(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static char * ngx_http_auth_ldap_servers(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static char * ngx_http_auth_ldap_resolver(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
static char * ngx_http_auth_ldap_parse_url(ngx_conf_t *cf, ngx_http_auth_ldap_server_t *server);
static char * ngx_http_auth_ldap_parse_binddn_passwd(ngx_conf_t *cf, ngx_http_auth_ldap_server_t *server);
static char * ngx_http_auth_ldap_parse_require(ngx_conf_t *cf, ngx_http_auth_ldap_server_t *server);
static char * ngx_http_auth_ldap_parse_satisfy(ngx_conf_t *cf, ngx_http_auth_ldap_server_t *server);
static char * ngx_http_auth_ldap_parse_referral(ngx_conf_t *cf, ngx_http_auth_ldap_server_t *server);
static void * ngx_http_auth_ldap_create_main_conf(ngx_conf_t *cf);
static char * ngx_http_auth_ldap_init_main_conf(ngx_conf_t *cf, void *parent);
static void * ngx_http_auth_ldap_create_loc_conf(ngx_conf_t *);
static char * ngx_http_auth_ldap_merge_loc_conf(ngx_conf_t *, void *, void *);
static ngx_int_t ngx_http_auth_ldap_init_worker(ngx_cycle_t *cycle);
static ngx_int_t ngx_http_auth_ldap_init(ngx_conf_t *cf);
static ngx_int_t ngx_http_auth_ldap_init_cache(ngx_cycle_t *cycle);
static void ngx_http_auth_ldap_close_connection(ngx_http_auth_ldap_connection_t *c, int retry_asap);
static void ngx_http_auth_ldap_set_pending_reconnection(ngx_http_auth_ldap_connection_t *c, ngx_msec_t reconnect_delay);
static void ngx_http_auth_ldap_read_handler(ngx_event_t *rev);
static void ngx_http_auth_ldap_connect(ngx_http_auth_ldap_connection_t *c);
static void ngx_http_auth_ldap_connect_continue(ngx_http_auth_ldap_connection_t *c);
static void ngx_http_auth_ldap_reconnect_handler(ngx_event_t *);
static void ngx_http_auth_ldap_reconnect_from_connection(ngx_http_auth_ldap_connection_t *c);
static void ngx_http_auth_ldap_resolve_handler(ngx_resolver_ctx_t *ctx);
static ngx_int_t ngx_http_auth_ldap_init_servers(ngx_cycle_t *cycle);
static ngx_int_t ngx_http_auth_ldap_init_connections(ngx_cycle_t *cycle);
static ngx_int_t ngx_http_auth_ldap_handler(ngx_http_request_t *r);
static ngx_int_t ngx_http_auth_ldap_authenticate(ngx_http_request_t *r, ngx_http_auth_ldap_ctx_t *ctx,
ngx_http_auth_ldap_loc_conf_t *conf);
static ngx_int_t ngx_http_auth_ldap_search(ngx_http_request_t *r, ngx_http_auth_ldap_ctx_t *ctx);
static ngx_int_t ngx_http_auth_ldap_check_user(ngx_http_request_t *r, ngx_http_auth_ldap_ctx_t *ctx);
static ngx_int_t ngx_http_auth_ldap_check_group(ngx_http_request_t *r, ngx_http_auth_ldap_ctx_t *ctx);
static ngx_int_t ngx_http_auth_ldap_check_bind(ngx_http_request_t *r, ngx_http_auth_ldap_ctx_t *ctx);
static ngx_int_t ngx_http_auth_ldap_recover_bind(ngx_http_request_t *r, ngx_http_auth_ldap_ctx_t *ctx);
#if (NGX_OPENSSL)
static ngx_int_t ngx_http_auth_ldap_restore_handlers(ngx_connection_t *conn);
#endif
static u_char * santitize_str(u_char *str, ngx_uint_t conv);
static ngx_uint_t my_hex_digit_value(u_char c);
static ngx_uint_t my_hex_decode(ngx_str_t *dst, ngx_str_t *src);
static void my_free_addrs_from_url(ngx_pool_t *pool, ngx_url_t *u);
ngx_http_auth_ldap_cache_t ngx_http_auth_ldap_cache;
static ngx_command_t ngx_http_auth_ldap_commands[] = {
{
ngx_string("ldap_server"),
NGX_HTTP_MAIN_CONF | NGX_CONF_BLOCK | NGX_CONF_TAKE1,
ngx_http_auth_ldap_ldap_server_block,
NGX_HTTP_MAIN_CONF_OFFSET,
0,
NULL
},
{
ngx_string("auth_ldap_cache_enabled"),
NGX_HTTP_MAIN_CONF | NGX_CONF_TAKE1,
ngx_conf_set_flag_slot,
NGX_HTTP_MAIN_CONF_OFFSET,
offsetof(ngx_http_auth_ldap_main_conf_t, cache_enabled),
NULL
},
{
ngx_string("auth_ldap_cache_expiration_time"),
NGX_HTTP_MAIN_CONF | NGX_CONF_TAKE1,
ngx_conf_set_msec_slot,
NGX_HTTP_MAIN_CONF_OFFSET,
offsetof(ngx_http_auth_ldap_main_conf_t, cache_expiration_time),
NULL
},
{
ngx_string("auth_ldap_cache_size"),
NGX_HTTP_MAIN_CONF | NGX_CONF_TAKE1,
ngx_conf_set_size_slot,
NGX_HTTP_MAIN_CONF_OFFSET,
offsetof(ngx_http_auth_ldap_main_conf_t, cache_size),
NULL
},
{
ngx_string("auth_ldap_servers_size"),
NGX_HTTP_MAIN_CONF | NGX_CONF_TAKE1,
ngx_conf_set_num_slot,
NGX_HTTP_MAIN_CONF_OFFSET,
offsetof(ngx_http_auth_ldap_main_conf_t, servers_size),
NULL
},
{
ngx_string("auth_ldap_resolver"),
NGX_HTTP_MAIN_CONF | NGX_CONF_1MORE,
ngx_http_auth_ldap_resolver,
NGX_HTTP_MAIN_CONF_OFFSET,
0,
NULL
},
{
ngx_string("auth_ldap_resolver_timeout"),
NGX_HTTP_MAIN_CONF | NGX_CONF_TAKE1,
ngx_conf_set_msec_slot,
NGX_HTTP_MAIN_CONF_OFFSET,
offsetof(ngx_http_auth_ldap_main_conf_t, resolver_timeout),
NULL
},
{
ngx_string("auth_ldap"),
NGX_HTTP_MAIN_CONF | NGX_HTTP_SRV_CONF | NGX_HTTP_LOC_CONF | NGX_HTTP_LMT_CONF | NGX_CONF_TAKE1,
ngx_http_auth_ldap,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL
},
{
ngx_string("auth_ldap_servers"),
NGX_HTTP_MAIN_CONF | NGX_HTTP_SRV_CONF | NGX_HTTP_LOC_CONF | NGX_HTTP_LMT_CONF | NGX_CONF_ANY,
ngx_http_auth_ldap_servers,
NGX_HTTP_LOC_CONF_OFFSET,
0,
NULL
},
ngx_null_command
};
static ngx_http_module_t ngx_http_auth_ldap_module_ctx = {
NULL, /* preconfiguration */
ngx_http_auth_ldap_init, /* postconfiguration */
ngx_http_auth_ldap_create_main_conf, /* create main configuration */
ngx_http_auth_ldap_init_main_conf, /* init main configuration */
NULL, /* create server configuration */
NULL, /* merge server configuration */
ngx_http_auth_ldap_create_loc_conf, /* create location configuration */
ngx_http_auth_ldap_merge_loc_conf /* merge location configuration */
};
ngx_module_t ngx_http_auth_ldap_module = {
NGX_MODULE_V1,
&ngx_http_auth_ldap_module_ctx, /* module context */
ngx_http_auth_ldap_commands, /* module directives */
NGX_HTTP_MODULE, /* module type */
NULL, /* init master */
NULL, /* init module */
ngx_http_auth_ldap_init_worker, /* init process */
NULL, /* init thread */
NULL, /* exit thread */
NULL, /* exit process */
NULL, /* exit master */
NGX_MODULE_V1_PADDING
};
/*** Tools ***/
static u_char * santitize_str(u_char *str, ngx_uint_t conv) {
static u_char sanitizeTable[256] = {0xff};
ngx_uint_t i;
u_char *p;
if (str == NULL || *str == '\0') {
return str;
}
// Initialize un-initialized table at first use
if (sanitizeTable[0] == 0xff) {
// Initialize un initialized table once
for (i = 0; i < sizeof(sanitizeTable); i++) {
// Convert any char other than ALPHA / DIGIT / "-" / "_" to the "_" char
sanitizeTable[i] = (isalnum(i) || i == '-' || i == '_') ? i : '_';
}
}
for (p = str; *p; p++) {
if (conv == SANITIZE_TO_UPPER && *p >= 97 && *p <= 122) {
// lowercase to uppercase
*p -= 32;
} else if (conv == SANITIZE_TO_LOWER && *p >= 65 && *p <= 90) {
// lowercase to uppercase
*p += 32;
} else {
*p = sanitizeTable[(int)*p];
}
}
return str; // Fluent interface
}
static ngx_uint_t
my_hex_digit_value(u_char c)
{
if (c >= '0' && c <= '9') {
return (ngx_uint_t)(c - '0');
}
if (c >= 'a' && c <= 'f') {
return (ngx_uint_t)(c - 'a' + 10);
}
if (c >= 'A' && c <= 'F') {
return (ngx_uint_t)(c - 'A' + 10);
}
return 0; // Not an hex digit
}
static ngx_uint_t
my_hex_decode(ngx_str_t *dst, ngx_str_t *src)
{
u_char *s, *d;
ngx_uint_t i;
for (i = 0, s = src->data, d = dst->data ; i < src->len -1; i += 2, s += 2) {
*d++ = (u_char)(16 * my_hex_digit_value(*s) + my_hex_digit_value(*(s + 1)));
}
dst->len = (d - dst->data);
return (ngx_uint_t)dst->len;
}
/*** Configuration and initialization ***/
/**
* Reads ldap_server block and sets ngx_http_auth_ldap_ldap_server as a handler of each conf value
*/
static char *
ngx_http_auth_ldap_ldap_server_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
char *rv;
ngx_str_t *value, name;
ngx_conf_t save;
ngx_http_auth_ldap_server_t *server;
ngx_http_auth_ldap_main_conf_t *cnf = conf;
value = cf->args->elts;
name = value[1];
if (ngx_strlen(name.data) == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: Missing server name in ldap_server");
return NGX_CONF_ERROR;
}
if (cnf->servers == NULL) {
if (cnf->servers_size == NGX_CONF_UNSET) {
cnf->servers_size = NGX_HTTP_AUTH_LDAP_MAX_SERVERS_SIZE;
}
cnf->servers = ngx_array_create(cf->pool, cnf->servers_size, sizeof(ngx_http_auth_ldap_server_t));
if (cnf->servers == NULL) {
return NGX_CONF_ERROR;
}
}
server = ngx_array_push(cnf->servers);
if (server == NULL) {
return NGX_CONF_ERROR;
}
ngx_memzero(server, sizeof(*server));
server->connect_timeout = 10000;
server->reconnect_timeout = 10000;
server->max_down_retries = 0;
server->bind_timeout = 5000;
server->request_timeout = 10000;
server->alias = name;
server->referral = 1;
server->clean_on_timeout = 0;
server->attribute_header_prefix.len = sizeof(LDAP_ATTR_HEADER_DEFAULT_PREFIX) -1;
server->attribute_header_prefix.data = (u_char *)LDAP_ATTR_HEADER_DEFAULT_PREFIX;
server->attrs = NULL;
save = *cf;
cf->handler = ngx_http_auth_ldap_ldap_server;
cf->handler_conf = conf;
rv = ngx_conf_parse(cf, NULL);
*cf = save;
if (rv != NGX_CONF_OK) {
return rv;
}
return NGX_CONF_OK;
}
#define CONF_MSEC_VALUE(cf,value,server,x) \
if (ngx_strcmp(value[0].data, #x) == 0) { \
ngx_msec_t _i = ngx_parse_time(&value[1], 0); \
if (_i == (ngx_msec_t) NGX_ERROR || _i == 0) { \
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: '" #x "' value has to be a valid time unit greater than 0"); \
return NGX_CONF_ERROR; \
} \
server->x = _i; \
}
/**
* Called for every variable inside ldap_server block
*/
static char *
ngx_http_auth_ldap_ldap_server(ngx_conf_t *cf, ngx_command_t *dummy, void *conf)
{
char *rv;
ngx_str_t *value;
ngx_http_auth_ldap_server_t *server;
ngx_http_auth_ldap_main_conf_t *cnf = conf;
ngx_int_t i;
/* It should be safe to just use latest server from array */
server = ((ngx_http_auth_ldap_server_t *) cnf->servers->elts + (cnf->servers->nelts - 1));
value = cf->args->elts;
/* TODO: Add more validation */
if (ngx_strcmp(value[0].data, "url") == 0) {
return ngx_http_auth_ldap_parse_url(cf, server);
} else if (ngx_strcmp(value[0].data, "binddn") == 0) {
server->bind_dn = value[1];
} else if (ngx_strcmp(value[0].data, "binddn_passwd") == 0) {
return ngx_http_auth_ldap_parse_binddn_passwd(cf, server);
} else if (ngx_strcmp(value[0].data, "group_attribute") == 0) {
server->group_attribute = value[1];
} else if (ngx_strcmp(value[0].data, "group_attribute_is_dn") == 0 && ngx_strcmp(value[1].data, "on") == 0) {
server->group_attribute_dn = 1;
} else if (ngx_strcmp(value[0].data, "search_attributes") == 0 && cf->args->nelts >= 2) {
ngx_uint_t j, attrs_count = cf->args->nelts -1;
server->attrs = ngx_palloc(cf->pool, (attrs_count + 1) * sizeof(char *));
for (j = 0; j < attrs_count; j++) {
server->attrs[j] = (char *)value[j + 1].data;
}
server->attrs[attrs_count] = NULL; // Last element of the list
} else if (ngx_strcmp(value[0].data, "attribute_header_prefix") == 0 && cf->args->nelts >= 2) {
santitize_str(value[1].data, SANITIZE_NO_CONV); // The prefix is sanitized
server->attribute_header_prefix = value[1];
} else if (ngx_strcmp(value[0].data, "require") == 0) {
return ngx_http_auth_ldap_parse_require(cf, server);
} else if (ngx_strcmp(value[0].data, "satisfy") == 0) {
return ngx_http_auth_ldap_parse_satisfy(cf, server);
} else if (ngx_strcmp(value[0].data, "referral") == 0) {
return ngx_http_auth_ldap_parse_referral(cf, server);
} else if (ngx_strcmp(value[0].data, "clean_on_timeout") == 0) {
if (ngx_strcasecmp(value[1].data, (u_char *) "on") == 0) {
server->clean_on_timeout = 1;
} else {
server->clean_on_timeout = 0;
}
} else if (ngx_strcmp(value[0].data, "max_down_retries") == 0) {
i = ngx_atoi(value[1].data, value[1].len);
if (i == NGX_ERROR) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: 'max_down_retries' value must be an integer: using default of 0");
i = 0;
}
server->max_down_retries = i;
} else if (ngx_strcmp(value[0].data, "connections") == 0) {
i = ngx_atoi(value[1].data, value[1].len);
if (i == NGX_ERROR || i == 0) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: 'connections' value has to be a number greater than 0");
return NGX_CONF_ERROR;
}
server->connections = i;
} else if (ngx_strcmp(value[0].data, "ssl_check_cert") == 0) {
#if OPENSSL_VERSION_NUMBER >= 0x10002000
if ((ngx_strcmp(value[1].data, "on") == 0) || (ngx_strcmp(value[1].data, "full") == 0)) {
server->ssl_check_cert = SSL_CERT_VERIFY_FULL;
} else if (ngx_strcmp(value[1].data, "chain") == 0) {
server->ssl_check_cert = SSL_CERT_VERIFY_CHAIN;
} else {
server->ssl_check_cert = SSL_CERT_VERIFY_OFF;
}
#else
#if GNUC > 4
#warning "http_auth_ldap: Compiling with OpenSSL < 1.0.2, certificate verification will be unavailable. OPENSSL_VERSION_NUMBER == " XSTR(OPENSSL_VERSION_NUMBER)
#endif
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
"http_auth_ldap: 'ssl_cert_check': cannot verify remote certificate's domain name because "
"your version of OpenSSL is too old. "
"Please install OpenSSL >= 1.0.2 and recompile nginx.");
#endif
} else if (ngx_strcmp(value[0].data, "ssl_ca_dir") == 0) {
server->ssl_ca_dir = value[1];
} else if (ngx_strcmp(value[0].data, "ssl_ca_file") == 0) {
server->ssl_ca_file = value[1];
}
else CONF_MSEC_VALUE(cf,value,server,connect_timeout)
else CONF_MSEC_VALUE(cf,value,server,reconnect_timeout)
else CONF_MSEC_VALUE(cf,value,server,bind_timeout)
else CONF_MSEC_VALUE(cf,value,server,request_timeout)
else if (ngx_strcmp(value[0].data, "include") == 0) {
return ngx_conf_include(cf, dummy, conf);
}
rv = NGX_CONF_OK;
return rv;
}
/**
* Parse auth_ldap directive
*/
static char *
ngx_http_auth_ldap(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_str_t *value = cf->args->elts;
ngx_http_auth_ldap_loc_conf_t *cnf = conf;
u_char *p;
if (ngx_strcmp(value[1].data, "off") == 0) {
ngx_str_set(&cnf->realm, "");
return NGX_CONF_OK;
}
cnf->realm.len = sizeof("Basic realm=\"") - 1 + value[1].len + 1;
cnf->realm.data = ngx_pcalloc(cf->pool, cnf->realm.len);
if (cnf->realm.data == NULL) {
return NGX_CONF_ERROR;
}
p = ngx_cpymem(cnf->realm.data, "Basic realm=\"", sizeof("Basic realm=\"") - 1);
p = ngx_cpymem(p, value[1].data, value[1].len);
*p = '"';
return NGX_CONF_OK;
}
/**
* Parse auth_ldap_servers directive
*/
static char *
ngx_http_auth_ldap_servers(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_auth_ldap_loc_conf_t *cnf;
ngx_http_auth_ldap_main_conf_t *mconf;
ngx_http_auth_ldap_server_t *server, *s, **target;
ngx_str_t *value;
ngx_uint_t i, j;
cnf = conf;
mconf = ngx_http_conf_get_module_main_conf(cf, ngx_http_auth_ldap_module);
for (i = 1; i < cf->args->nelts; i++) {
value = &((ngx_str_t *) cf->args->elts)[i];
server = NULL;
if (mconf->servers == NULL) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: Using \"auth_ldap_servers\" when no \"ldap_server\" has been previously defined"
" (make sure that \"auth_ldap_servers\" goes after \"ldap_server\"s in your configuration file)", value);
return NGX_CONF_ERROR;
}
for (j = 0; j < mconf->servers->nelts; j++) {
s = &((ngx_http_auth_ldap_server_t *) mconf->servers->elts)[j];
if (s->alias.len == value->len && ngx_memcmp(s->alias.data, value->data, s->alias.len) == 0) {
server = s;
break;
}
}
if (server == NULL) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: Server \"%V\" has not been defined", value);
return NGX_CONF_ERROR;
}
if (cnf->servers == NGX_CONF_UNSET_PTR) {
cnf->servers = ngx_array_create(cf->pool, 4, sizeof(ngx_http_auth_ldap_server_t *));
if (cnf->servers == NULL) {
return NGX_CONF_ERROR;
}
}
target = (ngx_http_auth_ldap_server_t **) ngx_array_push(cnf->servers);
if (target == NULL) {
return NGX_CONF_ERROR;
}
*target = server;
}
return NGX_CONF_OK;
}
/**
* Parse resolver directive
*/
static char *
ngx_http_auth_ldap_resolver(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
{
ngx_http_auth_ldap_main_conf_t *cnf = conf;
ngx_str_t *value;
if (cnf->resolver) {
return "is duplicate";
}
value = cf->args->elts;
cnf->resolver = ngx_resolver_create(cf, &value[1], cf->args->nelts - 1);
if (cnf->resolver == NULL) {
return NGX_CONF_ERROR;
}
ngx_conf_log_error(NGX_LOG_DEBUG, cf, 0,
"ngx_http_auth_ldap_resolver: Configured resolver %V",
&value[1]);
return NGX_CONF_OK;
}
/**
* Parse URL conf parameter
*/
static char *
ngx_http_auth_ldap_parse_url(ngx_conf_t *cf, ngx_http_auth_ldap_server_t *server)
{
ngx_str_t *value;
u_char *p;
value = cf->args->elts;
int rc = ldap_url_parse((const char *) value[1].data, &server->ludpp);
if (rc != LDAP_SUCCESS) {
switch (rc) {
case LDAP_URL_ERR_MEM:
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: Cannot allocate memory space.");
break;
case LDAP_URL_ERR_PARAM:
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: Invalid parameter.");
break;
case LDAP_URL_ERR_BADSCHEME:
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: URL doesnt begin with \"ldap[s]://\".");
break;
case LDAP_URL_ERR_BADENCLOSURE:
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: URL is missing trailing \">\".");
break;
case LDAP_URL_ERR_BADURL:
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: Invalid URL.");
break;
case LDAP_URL_ERR_BADHOST:
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: Host port is invalid.");
break;
case LDAP_URL_ERR_BADATTRS:
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: Invalid or missing attributes.");
break;
case LDAP_URL_ERR_BADSCOPE:
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: Invalid or missing scope string.");
break;
case LDAP_URL_ERR_BADFILTER:
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: Invalid or missing filter.");
break;
case LDAP_URL_ERR_BADEXTS:
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: Invalid or missing extensions.");
break;
}
return NGX_CONF_ERROR;
}
if (server->ludpp->lud_attrs == NULL) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: No user attribute specified in auth_ldap_url.");
return NGX_CONF_ERROR;
}
server->url.data = ngx_palloc(cf->pool, ngx_strlen(server->ludpp->lud_scheme) + sizeof("://") - 1 +
ngx_strlen(server->ludpp->lud_host) + sizeof(":65535"));
p = ngx_sprintf(server->url.data, "%s://%s:%d%Z", server->ludpp->lud_scheme, server->ludpp->lud_host,
server->ludpp->lud_port);
server->url.len = p - server->url.data - 1;
ngx_memzero(&server->parsed_url, sizeof(ngx_url_t));
server->parsed_url.url.data = (u_char *) server->ludpp->lud_host;
server->parsed_url.url.len = ngx_strlen(server->ludpp->lud_host);
server->parsed_url.default_port = server->ludpp->lud_port;
server->parsed_url.no_resolve = 1; // Do not use hostanme resolution checking during configuration parsing
if (ngx_parse_url(cf->pool, &server->parsed_url) != NGX_OK) {
if (server->parsed_url.err) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: %s in LDAP hostname \"%V\"",
server->parsed_url.err, &server->parsed_url.url);
}
return NGX_CONF_ERROR;
}
server->parsed_url.no_resolve = 0; // Reset the no_resolve flag
if (ngx_strcmp(server->ludpp->lud_scheme, "ldap") == 0) {
return NGX_CONF_OK;
#if (NGX_OPENSSL)
} else if (ngx_strcmp(server->ludpp->lud_scheme, "ldaps") == 0) {
ngx_http_auth_ldap_main_conf_t *halmcf =
ngx_http_conf_get_module_main_conf(cf, ngx_http_auth_ldap_module);
ngx_uint_t protos = NGX_SSL_SSLv2 | NGX_SSL_SSLv3 |
NGX_SSL_TLSv1 | NGX_SSL_TLSv1_1 | NGX_SSL_TLSv1_2;
if (halmcf->ssl.ctx == NULL && ngx_ssl_create(&halmcf->ssl, protos, halmcf) != NGX_OK) {
return NGX_CONF_ERROR;
}
return NGX_CONF_OK;
#endif
} else {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: Protocol \"%s://\" is not supported.",
server->ludpp->lud_scheme);
return NGX_CONF_ERROR;
}
}
static char *
ngx_http_auth_ldap_parse_binddn_passwd(ngx_conf_t *cf, ngx_http_auth_ldap_server_t *server)
{
ngx_str_t *value;
ngx_int_t encoding = ENCODING_TEXT;
value = cf->args->elts;
if (cf->args->nelts < 2 || cf->args->nelts > 3) {
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: Bad number of parameters for binddn_passwd");
return NGX_CONF_ERROR;
}
if (cf->args->nelts == 3 && value[1].len != 0) {
// Non empty password and have a second parameter value (encoding)
if (ngx_strcmp(value[2].data, "text") == 0) {
encoding = ENCODING_TEXT;
} else if (ngx_strcmp(value[2].data, "base64") == 0) {
encoding = ENCODING_B64;
} else if (ngx_strcmp(value[2].data, "hex") == 0) {
encoding = ENCODING_HEX;
} else {
ngx_conf_log_error(NGX_LOG_WARN, cf, 0,
"http_auth_ldap: Unknown encoding ('%V') for binddn_password. (assumming clear text)",
value[2]);
}
}
if (encoding == ENCODING_TEXT) {
// Just copy reference
server->bind_dn_passwd = value[1];
} else if (encoding == ENCODING_B64) {
// Base 64 decode
server->bind_dn_passwd.len = 0;
int decoded_length = 3 * value[1].len / 4;
server->bind_dn_passwd.data = ngx_pnalloc(cf->pool, decoded_length + 1);
ngx_decode_base64(&server->bind_dn_passwd, &value[1]);
server->bind_dn_passwd.data[decoded_length] = '\0';
} else if (encoding == ENCODING_HEX) {
// Hex decode
server->bind_dn_passwd.len = 0;
int decoded_length = value[1].len / 2;
server->bind_dn_passwd.data = ngx_pnalloc(cf->pool, decoded_length + 1);
my_hex_decode(&server->bind_dn_passwd, &value[1]);
server->bind_dn_passwd.data[decoded_length] = '\0';
}
return NGX_CONF_OK;
}
/**
* Parse "require" conf parameter
*/
static char *
ngx_http_auth_ldap_parse_require(ngx_conf_t *cf, ngx_http_auth_ldap_server_t *server)
{
ngx_str_t *value;
ngx_http_complex_value_t* target = NULL;
ngx_http_compile_complex_value_t ccv;
value = cf->args->elts;
//ngx_conf_log_error(NGX_LOG_DEBUG | NGX_LOG_DEBUG_HTTP, cf, 0, "http_auth_ldap: parse_require");
if (ngx_strcmp(value[1].data, "valid_user") == 0) {
server->require_valid_user = 1;
if (cf->args->nelts < 3) {
return NGX_CONF_OK;
}
if (server->require_valid_user_dn.value.data != NULL) {
return "is duplicate";
}
target = &server->require_valid_user_dn;
} else if (ngx_strcmp(value[1].data, "user") == 0) {
if (server->require_user == NULL) {
server->require_user = ngx_array_create(cf->pool, 4, sizeof(ngx_http_complex_value_t));
if (server->require_user == NULL) {
return NGX_CONF_ERROR;
}
}
target = ngx_array_push(server->require_user);
} else if (ngx_strcmp(value[1].data, "group") == 0) {
ngx_conf_log_error(NGX_LOG_NOTICE, cf, 0, "http_auth_ldap: Setting group");
if (server->require_group == NULL) {
server->require_group = ngx_array_create(cf->pool, 4, sizeof(ngx_http_complex_value_t));
if (server->require_group == NULL) {
return NGX_CONF_ERROR;
}
}
target = ngx_array_push(server->require_group);
}
if (target == NULL) {
return NGX_CONF_ERROR;
}
ngx_memzero(&ccv, sizeof(ngx_http_compile_complex_value_t));
ccv.cf = cf;
ccv.value = &value[2];
ccv.complex_value = target;
if (ngx_http_compile_complex_value(&ccv) != NGX_OK) {
return NGX_CONF_ERROR;
}
return NGX_CONF_OK;
}
/**
* Parse "satisfy" conf parameter
*/
static char *
ngx_http_auth_ldap_parse_satisfy(ngx_conf_t *cf, ngx_http_auth_ldap_server_t *server)
{
ngx_str_t *value;
value = cf->args->elts;
if (ngx_strcmp(value[1].data, "all") == 0) {
ngx_conf_log_error(NGX_LOG_NOTICE, cf, 0, "http_auth_ldap: Setting satisfy all");
server->satisfy_all = 1;
return NGX_CONF_OK;
}
if (ngx_strcmp(value[1].data, "any") == 0) {
server->satisfy_all = 0;
return NGX_CONF_OK;
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: Incorrect value for auth_ldap_satisfy");
return NGX_CONF_ERROR;
}
/**
* Parse "referral" conf parameter
*/
static char *
ngx_http_auth_ldap_parse_referral(ngx_conf_t *cf, ngx_http_auth_ldap_server_t *server)
{
ngx_str_t *value;
value = cf->args->elts;
if (ngx_strcmp(value[1].data, "on") == 0) {
server->referral = 1;
return NGX_CONF_OK;
}
if (ngx_strcmp(value[1].data, "off") == 0) {
server->referral = 0;
return NGX_CONF_OK;
}
ngx_conf_log_error(NGX_LOG_EMERG, cf, 0, "http_auth_ldap: Incorrect value for referral");
return NGX_CONF_ERROR;
}
/**
* Create main config which will store ldap_servers array
*/
static void *
ngx_http_auth_ldap_create_main_conf(ngx_conf_t *cf)
{
ngx_http_auth_ldap_main_conf_t *conf;
conf = ngx_pcalloc(cf->pool, sizeof(ngx_http_auth_ldap_main_conf_t));