Home | History | Annotate | Line # | Download | only in httpd 
      1 /*	$NetBSD: tilde-luzah-bozo.c,v 1.16 2018/11/22 08:54:08 mrg Exp $	*/
      2 
      3 /*	$eterna: tilde-luzah-bozo.c,v 1.16 2011/11/18 09:21:15 mrg Exp $	*/
      4 
      5 /*
      6  * Copyright (c) 1997-2018 Matthew R. Green
      7  * All rights reserved.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  * 1. Redistributions of source code must retain the above copyright
     13  *    notice, this list of conditions and the following disclaimer.
     14  * 2. Redistributions in binary form must reproduce the above copyright
     15  *    notice, this list of conditions and the following disclaimer and
     16  *    dedication in the documentation and/or other materials provided
     17  *    with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     20  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     21  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     22  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     23  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     24  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     25  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     26  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     27  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  *
     31  */
     32 
     33 /* this code implements ~user support for bozohttpd */
     34 
     35 #ifndef NO_USER_SUPPORT
     36 
     37 #include <sys/param.h>
     38 
     39 #include <assert.h>
     40 #include <errno.h>
     41 #include <pwd.h>
     42 #include <stdlib.h>
     43 #include <string.h>
     44 #include <unistd.h>
     45 
     46 #include "bozohttpd.h"
     47 
     48 /*
     49  * bozo_user_transform does this:
     50  *	- chdir's /~user/public_html
     51  *	- returns the rest of the file, index.html appended if required
     52  *	- returned malloced file to serve in request->hr_file,
     53  *        ala transform_request().
     54  *
     55  * transform_request() is supposed to check that we have user support
     56  * enabled.  returns 0 if handled/error, 1 if continue.
     57  */
     58 int
     59 bozo_user_transform(bozo_httpreq_t *request)
     60 {
     61 	bozohttpd_t *httpd = request->hr_httpd;
     62 	char	*s, *file = NULL, *user;
     63 	struct	passwd *pw;
     64 
     65 	/* find username */
     66 	user = strchr(request->hr_file + 1, '~');
     67 
     68 	/* this shouldn't happen, but "better paranoid than sorry" */
     69 	assert(user != NULL);
     70 
     71 	user++;
     72 
     73 	if ((s = strchr(user, '/')) != NULL) {
     74 		*s++ = '\0';
     75 	}
     76 
     77 	debug((httpd, DEBUG_OBESE, "looking for user %s",
     78 		user));
     79 	pw = getpwnam(user);
     80 	request->hr_user = bozostrdup(httpd, request, user);
     81 
     82 	/* fix this up immediately */
     83 	if (s) {
     84 		s[-1] = '/';
     85 		/* omit additional slashes at the beginning */
     86 		while (*s == '/')
     87 			s++;
     88 	}
     89 
     90 	if (pw == NULL) {
     91 		free(request->hr_user);
     92 		request->hr_user = NULL;
     93 		bozo_http_error(httpd, 404, request, "no such user");
     94 		return 0;
     95 	}
     96 
     97 	debug((httpd, DEBUG_OBESE, "user %s dir %s/%s uid %d gid %d",
     98 	      pw->pw_name, pw->pw_dir, httpd->public_html,
     99 	      pw->pw_uid, pw->pw_gid));
    100 
    101 	if (chdir(pw->pw_dir) < 0) {
    102 		bozowarn(httpd, "chdir1 error: %s: %s", pw->pw_dir,
    103 			strerror(errno));
    104 		bozo_http_error(httpd, 404, request, "can't chdir to homedir");
    105 		return 0;
    106 	}
    107 	if (chdir(httpd->public_html) < 0) {
    108 		bozowarn(httpd, "chdir2 error: %s: %s", httpd->public_html,
    109 			strerror(errno));
    110 		bozo_http_error(httpd, 404, request,
    111 				"can't chdir to public_html");
    112 		return 0;
    113 	}
    114 	if (s == NULL || *s == '\0') {
    115 		file = bozostrdup(httpd, request, "/");
    116 	} else {
    117 		file = bozomalloc(httpd, strlen(s) + 2);
    118 		strcpy(file, "/");
    119 		strcat(file, s);
    120 	}
    121 
    122 	free(request->hr_file);
    123 	request->hr_file = file;
    124 
    125 	debug((httpd, DEBUG_FAT, "transform_user returning %s under %s", file,
    126 	    pw->pw_dir));
    127 	return 1;
    128 }
    129 #endif /* NO_USER_SUPPORT */
    130