Patch from Glenn Engel
- more comments - larger allowed number of CGI script variables - ifdefs for regression test hooks - default to ./ rather than /www (if unspecified) for compatibility with earlier versions. - Allow ip: as a synomym for A: rules for compatibility with earlier versions. - Setting of CGI_ARGLIST_ when automatic setting of env vars for form scripting is utilized. This helps with minimal systems like openap.
This commit is contained in:
Glenn L McGrath
parent
0861e828d0
commit
4fe3ff8cff
@ -41,33 +41,70 @@
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*
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* The server can also be invoked as a url arg decoder and html text encoder
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* as follows:
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* foo=`httpd -d $foo` # decode "Hello%20World" as "Hello World"
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* foo=`httpd -d $foo` # decode "Hello%20World" as "Hello World"
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* bar=`httpd -e "<Hello World>"` # encode as "<Hello World>"
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* Note that url encoding for arguments is not the same as html encoding for
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* presenation. -d decodes a url-encoded argument while -e encodes in html
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* for page display.
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*
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* httpd.conf has the following format:
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*
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* A:172.20. # Allow any address that begins with 172.20
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* A:10.10. # Allow any address that begins with 10.10.
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* A:10.20 # Allow any address that previous set and 10.200-209.X.X
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* A:127.0.0.1 # Allow local loopback connections
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* D:* # Deny from other IP connections
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* /cgi-bin:foo:bar # Require user foo, pwd bar on urls starting with /cgi-bin/
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* /adm:admin:setup # Require user admin, pwd setup on urls starting with /adm/
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* /adm:toor:PaSsWd # or user toor, pwd PaSsWd on urls starting with /adm/
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* .au:audio/basic # additional mime type for audio.au files
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*
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* A/D may be as a/d or allow/deny - first char case unsensitive
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* Deny IP rules take precedence over allow rules. Any IP rules after D:* are
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* ignored.
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*
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*
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* The Deny/Allow IP logic:
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*
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* - Default is to allow all. No addresses are denied unless
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* denied with a D: rule.
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* - Order of Deny/Allow rules is significant
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* - Deny rules take precedence over allow rules.
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* - If a deny all rule (D:*) is used it acts as a catch-all for unmatched
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* addresses.
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* - Specification of Allow all (A:*) is a no-op
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*
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* Example:
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* 1. Allow only specified addresses
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* A:172.20. # Allow any address that begins with 172.20
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* A:10.10. # Allow any address that begins with 10.10.
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* A:10.10 # Allow any address that previous set and 10.100-109.X.X
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* A:127.0.0.1 # Allow local loopback connections
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* D:* # Deny from other IP connections
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*
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* 2. Only deny specified addresses
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* D:1.2.3. # deny from 1.2.3.0 - 1.2.3.255
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* D:2.3.4. # deny from 2.3.4.0 - 2.3.4.255
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* A:* # (optional line added for clarity)
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*
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* If a sub directory contains a config file it is parsed and merged with
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* any existing settings as if it was appended to the original configuration
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* except that all previous IP config rules are discarded.
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*
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* subdir paths are relative to the containing subdir and thus cannot
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* affect the parent rules.
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*
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* Note that since the sub dir is parsed in the forked thread servicing the
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* subdir http request, any merge is discarded when the process exits. As a
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* result, the subdir settings only have a lifetime of a single request.
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*
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*
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* If -c is not set, an attempt will be made to open the default
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* root configuration file. If -c is set and the file is not found, the
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* server exits with an error.
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*
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*/
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A:172.20. # Allow any address that begins with 172.20
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A:10.10. # Allow any address that begins with 10.10.
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A:10.10 # Allow any address that previous set and 10.100-109.X.X
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A:127.0.0.1 # Allow local loopback connections
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D:* # Deny from other IP connections
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/cgi-bin:foo:bar # Require user foo, pwd bar on urls starting with /cgi-bin/
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/adm:admin:setup # Require user admin, pwd setup on urls starting with /adm/
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/adm:toor:PaSsWd # or user toor, pwd PaSsWd on urls starting with /adm/
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.au:audio/basic # additional mime type for audio.au files
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A/D may be as a/d or allow/deny - first char case unsensitive parsed only.
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Each subdir can have config file.
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You can set less IP allow from subdir config.
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Password protection from subdir config can rewriten previous sets for
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current or/and next subpathes.
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For protect as user:pass current subdir and subpathes set from subdir config:
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/:user:pass
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/subpath:user2:pass2
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If -c don`t setted, used httpd root config, else httpd root config skiped.
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*/
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#include <stdio.h>
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#include <ctype.h> /* for isspace */
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@ -86,10 +123,10 @@ For protect as user:pass current subdir and subpathes set from subdir config:
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#include "busybox.h"
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static const char httpdVersion[] = "busybox httpd/1.25 10-May-2003";
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static const char httpdVersion[] = "busybox httpd/1.26 18-May-2003";
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static const char default_path_httpd_conf[] = "/etc";
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static const char httpd_conf[] = "httpd.conf";
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static const char home[] = "/www";
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static const char home[] = "./";
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// Note: bussybox xfuncs are not used because we want the server to keep running
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// if something bad happens due to a malformed user request.
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@ -160,7 +197,7 @@ void bb_show_usage(void)
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/* CGI environ size */
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#ifdef CONFIG_FEATURE_HTTPD_SET_CGI_VARS_TO_ENV
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#define ENVSIZE 50 /* set max 35 CGI_variable */
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#define ENVSIZE 70 /* set max CGI variable */
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#else
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#define ENVSIZE 15 /* minimal requires */
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#endif
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@ -325,7 +362,31 @@ static void free_config_lines(Htaccess **pprev)
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#define SUBDIR_PARSE 1
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#define SIGNALED_PARSE 2
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#define FIND_FROM_HTTPD_ROOT 3
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/****************************************************************************
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*
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> $Function: parse_conf()
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*
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* $Description: parse configuration file into in-memory linked list.
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*
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* The first non-white character is examined to determine if the config line
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* is one of the following:
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* .ext:mime/type # new mime type not compiled into httpd
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* [adAD]:from # ip address allow/deny, * for wildcard
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* /path:user:pass # username/password
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*
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* Any previous IP rules are discarded.
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* If the flag argument is not SUBDIR_PARSE then all /path and mime rules
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* are also discarded. That is, previous settings are retained if flag is
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* SUBDIR_PARSE.
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*
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* $Parameters:
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* (const char *) path . . null for ip address checks, path for password
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* checks.
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* (int) flag . . . . . . the source of the parse request.
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*
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* $Return: (None)
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*
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****************************************************************************/
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static void parse_conf(const char *path, int flag)
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{
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FILE *f;
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@ -335,17 +396,18 @@ static void parse_conf(const char *path, int flag)
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#endif
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const char *cf = config->configFile;
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char buf[80];
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char buf[160];
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char *p0 = NULL;
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char *c, *p;
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/* free previous setuped */
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/* free previous ip setup if present */
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free_config_lines(&config->ip_a_d);
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/* retain previous auth and mime config only for subdir parse */
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if(flag != SUBDIR_PARSE) {
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#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
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free_config_lines(&config->auth)
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#endif
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; /* syntax confuse */
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; /* appease compiler warnings if option is not set */
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#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
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free_config_lines(&config->mime_a);
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#endif
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@ -363,7 +425,7 @@ static void parse_conf(const char *path, int flag)
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while((f = fopen(cf, "r")) == NULL) {
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if(flag != FIRST_PARSE) {
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/* config file not found */
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/* config file not found, no changes to config */
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return;
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}
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if(config->configFile) /* if -c option given */
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@ -376,7 +438,7 @@ static void parse_conf(const char *path, int flag)
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prev = config->auth;
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#endif
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/* This could stand some work */
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while ( (p0 = fgets(buf, 80, f)) != NULL) {
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while ( (p0 = fgets(buf, sizeof(buf), f)) != NULL) {
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c = NULL;
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for(p = p0; *p0 != 0 && *p0 != '#'; p0++) {
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if(!isspace(*p0)) {
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@ -393,18 +455,20 @@ static void parse_conf(const char *path, int flag)
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if(*c == '*')
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*c = 0; /* Allow all */
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p0 = buf;
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if((*p0 == 'i') || (*p0 == 'I'))
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*p0 = 'A'; // version 1.1/1.2 compatibility for ip:
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if(*p0 == 'a')
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*p0 = 'A';
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if(*p0 == 'd')
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*p0 = 'D';
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if(*p0 != 'A' && *p0 != 'D'
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#ifdef CONFIG_FEATURE_HTTPD_BASIC_AUTH
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&& *p0 != '/'
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&& *p0 != '/'
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#endif
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#ifdef CONFIG_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
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&& *p0 != '.'
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&& *p0 != '.'
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#endif
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)
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)
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continue;
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if(*p0 == 'A' && *c == 0) {
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@ -681,9 +745,12 @@ static void addEnvCgi(const char *pargs)
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{
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char *args;
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char *memargs;
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char *namelist; /* space separated list of arg names */
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if (pargs==0) return;
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/* args are a list of name=value&name2=value2 sequences */
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namelist = (char *) malloc(strlen(pargs));
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if (namelist) namelist[0]=0;
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memargs = args = strdup(pargs);
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while (args && *args) {
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const char *name = args;
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@ -696,8 +763,14 @@ static void addEnvCgi(const char *pargs)
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if (args)
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*args++ = 0;
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addEnv("CGI", name, decodeString(value, 1));
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if (*namelist) strcat(namelist, " ");
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strcat(namelist,name);
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}
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free(memargs);
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if (namelist) {
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addEnv("CGI","ARGLIST_",namelist);
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free(namelist);
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}
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}
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#endif /* CONFIG_FEATURE_HTTPD_SET_CGI_VARS_TO_ENV */
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@ -1050,10 +1123,11 @@ static int sendCgi(const char *url,
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if(script) {
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*script = '\0';
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if(chdir(realpath_buff) == 0) {
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*script = '/';
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// now run the program. If it fails, use _exit() so no destructors
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// get called and make a mess.
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execve(realpath_buff, argp, config->envp);
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*script = '/';
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// now run the program. If it fails,
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// use _exit() so no destructors
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// get called and make a mess.
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execve(realpath_buff, argp, config->envp);
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}
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}
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}
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@ -1605,6 +1679,9 @@ static int miniHttpd(int server)
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exit(0);
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}
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close(s);
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#ifdef TEST
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return 0; // exit after processing one request
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#endif
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}
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}
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} // while (1)
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@ -1655,6 +1732,10 @@ int httpd_main(int argc, char *argv[])
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#endif
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{
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const char *home_httpd = home;
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#ifdef TEST
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const char *testArgs[5];
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int numTestArgs=0;
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#endif
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#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
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int server;
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@ -1689,6 +1770,9 @@ int httpd_main(int argc, char *argv[])
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#endif
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#ifdef CONFIG_FEATURE_HTTPD_SETUID
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"u:"
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#endif
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#ifdef TEST
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"t:"
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#endif
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);
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if (c == EOF) break;
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@ -1734,6 +1818,11 @@ int httpd_main(int argc, char *argv[])
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}
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}
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break;
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#endif
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#ifdef TEST
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case 't':
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testArgs[numTestArgs++]=optarg;
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break;
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#endif
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default:
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bb_error_msg("%s", httpdVersion);
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@ -1762,6 +1851,17 @@ int httpd_main(int argc, char *argv[])
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parse_conf(default_path_httpd_conf, FIRST_PARSE);
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#endif
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#ifdef TEST
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if (numTestArgs)
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{
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if (strcmp(testArgs[0],"ip") == 0) testArgs[0] = 0;
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if (numTestArgs > 2)
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parse_conf(testArgs[2], SUBDIR_PARSE);
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int result = printf("%d\n",checkPerm(testArgs[0],testArgs[1]));
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return result;
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}
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#endif
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#ifndef CONFIG_FEATURE_HTTPD_USAGE_FROM_INETD_ONLY
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if (!config->debugHttpd) {
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if (daemon(1, 0) < 0) /* don`t change curent directory */
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