| /* Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| /* |
| * mod_ident: Handle RFC 1413 ident request |
| * obtained from rfc1413.c |
| * |
| * rfc1413() speaks a common subset of the RFC 1413, AUTH, TAP and IDENT |
| * protocols. The code queries an RFC 1413 etc. compatible daemon on a remote |
| * host to look up the owner of a connection. The information should not be |
| * used for authentication purposes. This routine intercepts alarm signals. |
| * |
| * Author: Wietse Venema, Eindhoven University of Technology, |
| * The Netherlands. |
| */ |
| |
| /* Some small additions for Apache --- ditch the "sccsid" var if |
| * compiling with gcc (it *has* changed), include ap_config.h for the |
| * prototypes it defines on at least one system (SunlOSs) which has |
| * them missing from the standard header files, and one minor change |
| * below (extra parens around assign "if (foo = bar) ..." to shut up |
| * gcc -Wall). |
| */ |
| |
| /* Rewritten by David Robinson */ |
| |
| #include "apr.h" |
| #include "apr_network_io.h" |
| #include "apr_strings.h" |
| #include "apr_optional.h" |
| |
| #define APR_WANT_STDIO |
| #define APR_WANT_STRFUNC |
| #include "apr_want.h" |
| |
| #include "httpd.h" /* for server_rec, conn_rec, etc. */ |
| #include "http_config.h" |
| #include "http_core.h" |
| #include "http_log.h" /* for aplog_error */ |
| #include "util_ebcdic.h" |
| |
| /* Whether we should enable rfc1413 identity checking */ |
| #ifndef DEFAULT_RFC1413 |
| #define DEFAULT_RFC1413 0 |
| #endif |
| |
| #define RFC1413_UNSET 2 |
| |
| /* request timeout (sec) */ |
| #ifndef RFC1413_TIMEOUT |
| #define RFC1413_TIMEOUT 30 |
| #endif |
| |
| /* Local stuff. */ |
| |
| /* Semi-well-known port */ |
| #define RFC1413_PORT 113 |
| |
| /* maximum allowed length of userid */ |
| #define RFC1413_USERLEN 512 |
| |
| /* rough limit on the amount of data we accept. */ |
| #define RFC1413_MAXDATA 1000 |
| |
| /* default username, if it could not determined */ |
| #define FROM_UNKNOWN "unknown" |
| |
| typedef struct { |
| int do_rfc1413; |
| int timeout_unset; |
| apr_time_t timeout; |
| } ident_config_rec; |
| |
| static apr_status_t rfc1413_connect(apr_socket_t **newsock, conn_rec *conn, |
| server_rec *srv, apr_time_t timeout) |
| { |
| apr_status_t rv; |
| apr_sockaddr_t *localsa, *destsa; |
| |
| if ((rv = apr_sockaddr_info_get(&localsa, conn->local_ip, APR_UNSPEC, |
| 0, /* ephemeral port */ |
| 0, conn->pool)) != APR_SUCCESS) { |
| /* This should not fail since we have a numeric address string |
| * as the host. */ |
| ap_log_error(APLOG_MARK, APLOG_CRIT, rv, srv, APLOGNO(01492) |
| "rfc1413: apr_sockaddr_info_get(%s) failed", |
| conn->local_ip); |
| return rv; |
| } |
| |
| if ((rv = apr_sockaddr_info_get(&destsa, conn->client_ip, |
| localsa->family, /* has to match */ |
| RFC1413_PORT, 0, conn->pool)) != APR_SUCCESS) { |
| /* This should not fail since we have a numeric address string |
| * as the host. */ |
| ap_log_error(APLOG_MARK, APLOG_CRIT, rv, srv, APLOGNO(01493) |
| "rfc1413: apr_sockaddr_info_get(%s) failed", |
| conn->client_ip); |
| return rv; |
| } |
| |
| if ((rv = apr_socket_create(newsock, |
| localsa->family, /* has to match */ |
| SOCK_STREAM, 0, conn->pool)) != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_CRIT, rv, srv, APLOGNO(01494) |
| "rfc1413: error creating query socket"); |
| return rv; |
| } |
| |
| if ((rv = apr_socket_timeout_set(*newsock, timeout)) != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_CRIT, rv, srv, APLOGNO(01495) |
| "rfc1413: error setting query socket timeout"); |
| apr_socket_close(*newsock); |
| return rv; |
| } |
| |
| /* |
| * Bind the local and remote ends of the query socket to the same |
| * IP addresses as the connection under investigation. We go |
| * through all this trouble because the local or remote system |
| * might have more than one network address. The RFC1413 etc. |
| * client sends only port numbers; the server takes the IP |
| * addresses from the query socket. |
| */ |
| |
| if ((rv = apr_socket_bind(*newsock, localsa)) != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_CRIT, rv, srv, APLOGNO(01496) |
| "rfc1413: Error binding query socket to local port"); |
| apr_socket_close(*newsock); |
| return rv; |
| } |
| |
| /* |
| * errors from connect usually imply the remote machine doesn't support |
| * the service; don't log such an error |
| */ |
| if ((rv = apr_socket_connect(*newsock, destsa)) != APR_SUCCESS) { |
| apr_socket_close(*newsock); |
| return rv; |
| } |
| |
| return APR_SUCCESS; |
| } |
| |
| static apr_status_t rfc1413_query(apr_socket_t *sock, conn_rec *conn, |
| server_rec *srv) |
| { |
| apr_port_t rmt_port, our_port; |
| apr_port_t sav_rmt_port, sav_our_port; |
| apr_size_t i; |
| char *cp; |
| char buffer[RFC1413_MAXDATA + 1]; |
| char user[RFC1413_USERLEN + 1]; /* XXX */ |
| apr_size_t buflen; |
| |
| sav_our_port = conn->local_addr->port; |
| sav_rmt_port = conn->client_addr->port; |
| |
| /* send the data */ |
| buflen = apr_snprintf(buffer, sizeof(buffer), "%hu,%hu\r\n", sav_rmt_port, |
| sav_our_port); |
| ap_xlate_proto_to_ascii(buffer, buflen); |
| |
| /* send query to server. Handle short write. */ |
| i = 0; |
| while (i < buflen) { |
| apr_size_t j = strlen(buffer + i); |
| apr_status_t status; |
| status = apr_socket_send(sock, buffer+i, &j); |
| if (status != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_CRIT, status, srv, APLOGNO(01497) |
| "write: rfc1413: error sending request"); |
| return status; |
| } |
| else if (j > 0) { |
| i+=j; |
| } |
| } |
| |
| /* |
| * Read response from server. - the response should be newline |
| * terminated according to rfc - make sure it doesn't stomp its |
| * way out of the buffer. |
| */ |
| |
| i = 0; |
| memset(buffer, '\0', sizeof(buffer)); |
| /* |
| * Note that the strchr function below checks for \012 instead of '\n' |
| * this allows it to work on both ASCII and EBCDIC machines. |
| */ |
| while ((cp = strchr(buffer, '\012')) == NULL && i < sizeof(buffer) - 1) { |
| apr_size_t j = sizeof(buffer) - 1 - i; |
| apr_status_t status; |
| status = apr_socket_recv(sock, buffer+i, &j); |
| if (status != APR_SUCCESS) { |
| ap_log_error(APLOG_MARK, APLOG_CRIT, status, srv, APLOGNO(01498) |
| "read: rfc1413: error reading response"); |
| return status; |
| } |
| else if (j > 0) { |
| i+=j; |
| } |
| else if (status == APR_SUCCESS && j == 0) { |
| /* Oops... we ran out of data before finding newline */ |
| return APR_EINVAL; |
| } |
| } |
| |
| /* RFC1413_USERLEN = 512 */ |
| ap_xlate_proto_from_ascii(buffer, i); |
| if (sscanf(buffer, "%hu , %hu : USERID :%*[^:]:%512s", &rmt_port, &our_port, |
| user) != 3 || sav_rmt_port != rmt_port |
| || sav_our_port != our_port) |
| return APR_EINVAL; |
| |
| /* |
| * Strip trailing carriage return. It is part of the |
| * protocol, not part of the data. |
| */ |
| |
| if ((cp = strchr(user, '\r'))) |
| *cp = '\0'; |
| |
| conn->remote_logname = apr_pstrdup(conn->pool, user); |
| |
| return APR_SUCCESS; |
| } |
| |
| static const char *set_idcheck(cmd_parms *cmd, void *d_, int arg) |
| { |
| ident_config_rec *d = d_; |
| |
| d->do_rfc1413 = arg ? 1 : 0; |
| return NULL; |
| } |
| |
| static const char *set_timeout(cmd_parms *cmd, void *d_, const char *arg) |
| { |
| ident_config_rec *d = d_; |
| |
| d->timeout = apr_time_from_sec(atoi(arg)); |
| d->timeout_unset = 0; |
| return NULL; |
| } |
| |
| static void *create_ident_dir_config(apr_pool_t *p, char *d) |
| { |
| ident_config_rec *conf = apr_palloc(p, sizeof(*conf)); |
| |
| conf->do_rfc1413 = DEFAULT_RFC1413 | RFC1413_UNSET; |
| conf->timeout = apr_time_from_sec(RFC1413_TIMEOUT); |
| conf->timeout_unset = 1; |
| |
| return (void *)conf; |
| } |
| |
| static void *merge_ident_dir_config(apr_pool_t *p, void *old_, void *new_) |
| { |
| ident_config_rec *conf = (ident_config_rec *)apr_pcalloc(p, sizeof(*conf)); |
| ident_config_rec *old = (ident_config_rec *) old_; |
| ident_config_rec *new = (ident_config_rec *) new_; |
| |
| conf->timeout = new->timeout_unset |
| ? old->timeout |
| : new->timeout; |
| |
| conf->do_rfc1413 = new->do_rfc1413 & RFC1413_UNSET |
| ? old->do_rfc1413 |
| : new->do_rfc1413; |
| |
| return (void *)conf; |
| } |
| |
| static const command_rec ident_cmds[] = |
| { |
| AP_INIT_FLAG("IdentityCheck", set_idcheck, NULL, RSRC_CONF|ACCESS_CONF, |
| "Enable identd (RFC 1413) user lookups - SLOW"), |
| AP_INIT_TAKE1("IdentityCheckTimeout", set_timeout, NULL, |
| RSRC_CONF|ACCESS_CONF, |
| "Identity check (RFC 1413) timeout duration (sec)"), |
| {NULL} |
| }; |
| |
| module AP_MODULE_DECLARE_DATA ident_module; |
| |
| /* |
| * Optional function for the core to the actual ident request |
| */ |
| static const char *ap_ident_lookup(request_rec *r) |
| { |
| ident_config_rec *conf; |
| apr_socket_t *sock; |
| apr_status_t rv; |
| conn_rec *conn = r->connection; |
| server_rec *srv = r->server; |
| |
| conf = ap_get_module_config(r->per_dir_config, &ident_module); |
| |
| /* return immediately if ident requests are disabled */ |
| if (!(conf->do_rfc1413 & ~RFC1413_UNSET)) { |
| return NULL; |
| } |
| |
| rv = rfc1413_connect(&sock, conn, srv, conf->timeout); |
| if (rv == APR_SUCCESS) { |
| rv = rfc1413_query(sock, conn, srv); |
| apr_socket_close(sock); |
| } |
| if (rv != APR_SUCCESS) { |
| conn->remote_logname = FROM_UNKNOWN; |
| } |
| |
| return (const char *)conn->remote_logname; |
| } |
| |
| static void register_hooks(apr_pool_t *p) |
| { |
| APR_REGISTER_OPTIONAL_FN(ap_ident_lookup); |
| } |
| |
| AP_DECLARE_MODULE(ident) = |
| { |
| STANDARD20_MODULE_STUFF, |
| create_ident_dir_config, /* dir config creater */ |
| merge_ident_dir_config, /* dir merger --- default is to override */ |
| NULL, /* server config */ |
| NULL, /* merge server config */ |
| ident_cmds, /* command apr_table_t */ |
| register_hooks /* register hooks */ |
| }; |
