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47 * ====================================================================
49 * This software consists of voluntary contributions made by many
50 * individuals on behalf of the Apache Software Foundation. For more
51 * information on the Apache Software Foundation, please see
52 * <http://www.apache.org/>.
54 * Portions of this software are based upon public domain software
55 * originally written at the National Center for Supercomputing Applications,
56 * University of Illinois, Urbana-Champaign.
60 * mod_userdir... implement the UserDir command. Broken away from the
61 * Alias stuff for a couple of good and not-so-good reasons:
63 * 1) It shows a real minimal working example of how to do something like
65 * 2) I know people who are actually interested in changing this *particular*
66 * aspect of server functionality without changing the rest of it. That's
67 * what this whole modular arrangement is supposed to be good at...
69 * Modified by Alexei Kosut to support the following constructs
70 * (server running at www.foo.com, request for /~bar/one/two.html)
72 * UserDir public_html -> ~bar/public_html/one/two.html
73 * UserDir /usr/web -> /usr/web/bar/one/two.html
74 * UserDir /home/ * /www -> /home/bar/www/one/two.html
75 * NOTE: theses ^ ^ space only added allow it to work in a comment, ignore
76 * UserDir http://x/users -> (302) http://x/users/bar/one/two.html
77 * UserDir http://x/ * /y -> (302) http://x/bar/y/one/two.html
80 * In addition, you can use multiple entries, to specify alternate
81 * user directories (a la Directory Index). For example:
83 * UserDir public_html /usr/web http://www.xyz.com/users
85 * Modified by Ken Coar to provide for the following:
87 * UserDir disable[d] username ...
88 * UserDir enable[d] username ...
90 * If "disabled" has no other arguments, *all* ~<username> references are
91 * disabled, except those explicitly turned on with the "enabled" keyword.
94 #include "apr_strings.h"
97 #define APR_WANT_STRFUNC
100 #if APR_HAVE_UNISTD_H
104 #include "ap_config.h"
106 #include "http_config.h"
107 #include "http_request.h"
109 #if !defined(WIN32) && !defined(OS2) && !defined(BEOS) && !defined(NETWARE)
110 #define HAVE_UNIX_SUEXEC
113 #ifdef HAVE_UNIX_SUEXEC
114 #include "unixd.h" /* Contains the suexec_identity hook used on Unix */
118 /* The default directory in user's home dir */
119 #ifndef DEFAULT_USER_DIR
120 #define DEFAULT_USER_DIR "public_html"
123 module AP_MODULE_DECLARE_DATA userdir_module;
126 int globally_disabled;
128 apr_table_t *enabled_users;
129 apr_table_t *disabled_users;
133 * Server config for this module: global disablement flag, a list of usernames
134 * ineligible for UserDir access, a list of those immune to global (but not
135 * explicit) disablement, and the replacement string for all others.
138 static void *create_userdir_config(apr_pool_t *p, server_rec *s)
140 userdir_config *newcfg = apr_pcalloc(p, sizeof(*newcfg));
142 newcfg->globally_disabled = 0;
143 newcfg->userdir = DEFAULT_USER_DIR;
144 newcfg->enabled_users = apr_table_make(p, 4);
145 newcfg->disabled_users = apr_table_make(p, 4);
154 static const char *set_user_dir(cmd_parms *cmd, void *dummy, const char *arg)
156 userdir_config *s_cfg = ap_get_module_config(cmd->server->module_config,
159 const char *usernames = arg;
160 char *kw = ap_getword_conf(cmd->pool, &usernames);
161 apr_table_t *usertable;
164 * Let's do the comparisons once.
166 if ((!strcasecmp(kw, "disable")) || (!strcasecmp(kw, "disabled"))) {
168 * If there are no usernames specified, this is a global disable - we
169 * need do no more at this point than record the fact.
171 if (strlen(usernames) == 0) {
172 s_cfg->globally_disabled = 1;
175 usertable = s_cfg->disabled_users;
177 else if ((!strcasecmp(kw, "enable")) || (!strcasecmp(kw, "enabled"))) {
179 * The "disable" keyword can stand alone or take a list of names, but
180 * the "enable" keyword requires the list. Whinge if it doesn't have
183 if (strlen(usernames) == 0) {
184 return "UserDir \"enable\" keyword requires a list of usernames";
186 usertable = s_cfg->enabled_users;
190 * If the first (only?) value isn't one of our keywords, just copy
191 * the string to the userdir string.
193 s_cfg->userdir = apr_pstrdup(cmd->pool, arg);
197 * Now we just take each word in turn from the command line and add it to
198 * the appropriate table.
201 username = ap_getword_conf(cmd->pool, &usernames);
202 apr_table_setn(usertable, username, kw);
207 static const command_rec userdir_cmds[] = {
208 AP_INIT_RAW_ARGS("UserDir", set_user_dir, NULL, RSRC_CONF,
209 "the public subdirectory in users' home directories, or "
210 "'disabled', or 'disabled username username...', or "
211 "'enabled username username...'"),
215 static int translate_userdir(request_rec *r)
217 ap_conf_vector_t *server_conf = r->server->module_config;
218 const userdir_config *s_cfg = ap_get_module_config(server_conf,
221 const char *userdirs = s_cfg->userdir;
222 const char *w, *dname;
228 * If the URI doesn't match our basic pattern, we've nothing to do with
231 if (s_cfg->userdir == NULL || name[0] != '/' || name[1] != '~') {
236 w = ap_getword(r->pool, &dname, '/');
239 * The 'dname' funny business involves backing it up to capture the '/'
240 * delimiting the "/~user" part from the rest of the URL, in case there
241 * was one (the case where there wasn't being just "GET /~user HTTP/1.0",
242 * for which we don't want to tack on a '/' onto the filename).
245 if (dname[-1] == '/') {
250 * If there's no username, it's not for us. Ignore . and .. as well.
252 if (w[0] == '\0' || (w[1] == '.' && (w[2] == '\0' || (w[2] == '.' && w[3] == '\0')))) {
256 * Nor if there's an username but it's in the disabled list.
258 if (apr_table_get(s_cfg->disabled_users, w) != NULL) {
262 * If there's a global interdiction on UserDirs, check to see if this
263 * name is one of the Blessed.
265 if (s_cfg->globally_disabled
266 && apr_table_get(s_cfg->enabled_users, w) == NULL) {
271 * Special cases all checked, onward to normal substitution processing.
275 const char *userdir = ap_getword_conf(r->pool, &userdirs);
276 char *filename = NULL;
278 int is_absolute = ap_os_is_path_absolute(r->pool, userdir);
280 if (ap_strchr_c(userdir, '*'))
281 x = ap_getword(r->pool, &userdir, '*');
283 if (userdir[0] == '\0' || is_absolute) {
285 #ifdef HAVE_DRIVE_LETTERS
287 * Crummy hack. Need to figure out whether we have been
288 * redirected to a URL or to a file on some drive. Since I
289 * know of no protocols that are a single letter, ignore
290 * a : as the first or second character, and assume a file
293 if (strchr(x + 2, ':'))
295 if (strchr(x, ':') && !is_absolute)
296 #endif /* HAVE_DRIVE_LETTERS */
298 redirect = apr_pstrcat(r->pool, x, w, userdir, dname, NULL);
299 apr_table_setn(r->headers_out, "Location", redirect);
300 return HTTP_MOVED_TEMPORARILY;
303 filename = apr_pstrcat(r->pool, x, w, userdir, NULL);
306 filename = apr_pstrcat(r->pool, userdir, "/", w, NULL);
308 else if (ap_strchr_c(userdir, ':')) {
309 redirect = apr_pstrcat(r->pool, userdir, "/", w, dname, NULL);
310 apr_table_setn(r->headers_out, "Location", redirect);
311 return HTTP_MOVED_TEMPORARILY;
317 if (apr_get_home_directory(&homedir, w, r->pool) == APR_SUCCESS) {
318 filename = apr_pstrcat(r->pool, homedir, "/", userdir, NULL);
329 * Now see if it exists, or we're at the last entry. If we are at the
330 * last entry, then use the filename generated (if there is one)
331 * anyway, in the hope that some handler might handle it. This can be
332 * used, for example, to run a CGI script for the user.
334 if (filename && (!*userdirs
335 || ((rv = apr_stat(&statbuf, filename, APR_FINFO_MIN,
336 r->pool)) == APR_SUCCESS
337 || rv == APR_INCOMPLETE))) {
338 r->filename = apr_pstrcat(r->pool, filename, dname, NULL);
339 /* XXX: Does this walk us around FollowSymLink rules?
340 * When statbuf contains info on r->filename we can save a syscall
341 * by copying it to r->finfo
343 if (*userdirs && dname[0] == 0)
346 /* For use in the get_suexec_identity phase */
347 apr_table_setn(r->notes, "mod_userdir_user", w);
356 #ifdef HAVE_UNIX_SUEXEC
357 static ap_unix_identity_t *get_suexec_id_doer(const request_rec *r)
359 ap_unix_identity_t *ugid = NULL;
361 const char *username = apr_table_get(r->notes, "mod_userdir_user");
363 if (username == NULL) {
367 if ((ugid = apr_palloc(r->pool, sizeof(ap_unix_identity_t *))) == NULL) {
371 if (apr_get_userid(&ugid->uid, &ugid->gid, username, r->pool) != APR_SUCCESS) {
378 #endif /* HAVE_UNIX_SUEXEC */
380 static void register_hooks(apr_pool_t *p)
382 static const char * const aszSucc[]={ "mod_alias.c",NULL };
384 ap_hook_translate_name(translate_userdir,NULL,aszSucc,APR_HOOK_MIDDLE);
385 #ifdef HAVE_UNIX_SUEXEC
386 ap_hook_get_suexec_identity(get_suexec_id_doer,NULL,NULL,APR_HOOK_MIDDLE);
390 module AP_MODULE_DECLARE_DATA userdir_module = {
391 STANDARD20_MODULE_STUFF,
392 NULL, /* dir config creater */
393 NULL, /* dir merger --- default is to override */
394 create_userdir_config, /* server config */
395 NULL, /* merge server config */
396 userdir_cmds, /* command apr_table_t */
397 register_hooks /* register hooks */