/* vi: set sw=4 ts=4: */ /* * httpd implementation for busybox * * Copyright (C) 2002,2003 Glenn Engel * Copyright (C) 2003-2006 Vladimir Oleynik * * Licensed under GPLv2 or later, see file LICENSE in this source tree. * ***************************************************************************** * * Typical usage: * For non root user: * httpd -p 8080 -h $HOME/public_html * For daemon start from rc script with uid=0: * httpd -u www * which is equivalent to (assuming user www has uid 80): * httpd -p 80 -u 80 -h $PWD -c /etc/httpd.conf -r "Web Server Authentication" * * When an url starts with "/cgi-bin/" it is assumed to be a cgi script. * The server changes directory to the location of the script and executes it * after setting QUERY_STRING and other environment variables. * * If directory URL is given, no index.html is found and CGI support is enabled, * cgi-bin/index.cgi will be run. Directory to list is ../$QUERY_STRING. * See httpd_indexcgi.c for an example GCI code. * * Doc: * "CGI Environment Variables": http://hoohoo.ncsa.uiuc.edu/cgi/env.html * * The applet can also be invoked as an url arg decoder and html text encoder * as follows: * foo=`httpd -d $foo` # decode "Hello%20World" as "Hello World" * bar=`httpd -e ""` # encode as "<Hello World>" * Note that url encoding for arguments is not the same as html encoding for * presentation. -d decodes an url-encoded argument while -e encodes in html * for page display. * * httpd.conf has the following format: * * H:/serverroot # define the server root. It will override -h * A:172.20. # Allow address from 172.20.0.0/16 * A:10.0.0.0/25 # Allow any address from 10.0.0.0-10.0.0.127 * A:10.0.0.0/255.255.255.128 # Allow any address that previous set * A:127.0.0.1 # Allow local loopback connections * D:* # Deny from other IP connections * E404:/path/e404.html # /path/e404.html is the 404 (not found) error page * I:index.html # Show index.html when a directory is requested * * P:/url:[http://]hostname[:port]/new/path * # When /urlXXXXXX is requested, reverse proxy * # it to http://hostname[:port]/new/pathXXXXXX * * /cgi-bin:foo:bar # Require user foo, pwd bar on urls starting with /cgi-bin/ * /adm:admin:setup # Require user admin, pwd setup on urls starting with /adm/ * /adm:toor:PaSsWd # or user toor, pwd PaSsWd on urls starting with /adm/ * /adm:root:* # or user root, pwd from /etc/passwd on urls starting with /adm/ * /wiki:*:* # or any user from /etc/passwd with according pwd on urls starting with /wiki/ * .au:audio/basic # additional mime type for audio.au files * *.php:/path/php # run xxx.php through an interpreter * * A/D may be as a/d or allow/deny - only first char matters. * Deny/Allow IP logic: * - Default is to allow all (Allow all (A:*) is a no-op). * - Deny rules take precedence over allow rules. * - "Deny all" rule (D:*) is applied last. * * Example: * 1. Allow only specified addresses * A:172.20 # Allow any address that begins with 172.20. * A:10.10. # Allow any address that begins with 10.10. * A:127.0.0.1 # Allow local loopback connections * D:* # Deny from other IP connections * * 2. Only deny specified addresses * D:1.2.3. # deny from 1.2.3.0 - 1.2.3.255 * D:2.3.4. # deny from 2.3.4.0 - 2.3.4.255 * A:* # (optional line added for clarity) * * If a sub directory contains config file, it is parsed and merged with * any existing settings as if it was appended to the original configuration. * * subdir paths are relative to the containing subdir and thus cannot * affect the parent rules. * * Note that since the sub dir is parsed in the forked thread servicing the * subdir http request, any merge is discarded when the process exits. As a * result, the subdir settings only have a lifetime of a single request. * * Custom error pages can contain an absolute path or be relative to * 'home_httpd'. Error pages are to be static files (no CGI or script). Error * page can only be defined in the root configuration file and are not taken * into account in local (directories) config files. * * If -c is not set, an attempt will be made to open the default * root configuration file. If -c is set and the file is not found, the * server exits with an error. */ //config:config HTTPD //config: bool "httpd (32 kb)" //config: default y //config: help //config: HTTP server. //config: //config:config FEATURE_HTTPD_RANGES //config: bool "Support 'Ranges:' header" //config: default y //config: depends on HTTPD //config: help //config: Makes httpd emit "Accept-Ranges: bytes" header and understand //config: "Range: bytes=NNN-[MMM]" header. Allows for resuming interrupted //config: downloads, seeking in multimedia players etc. //config: //config:config FEATURE_HTTPD_SETUID //config: bool "Enable -u option" //config: default y //config: depends on HTTPD //config: help //config: This option allows the server to run as a specific user //config: rather than defaulting to the user that starts the server. //config: Use of this option requires special privileges to change to a //config: different user. //config: //config:config FEATURE_HTTPD_BASIC_AUTH //config: bool "Enable HTTP authentication" //config: default y //config: depends on HTTPD //config: help //config: Utilizes password settings from /etc/httpd.conf for basic //config: authentication on a per url basis. //config: Example for httpd.conf file: //config: /adm:toor:PaSsWd //config: //config:config FEATURE_HTTPD_AUTH_MD5 //config: bool "Support MD5-encrypted passwords in HTTP authentication" //config: default y //config: depends on FEATURE_HTTPD_BASIC_AUTH //config: help //config: Enables encrypted passwords, and wildcard user/passwords //config: in httpd.conf file. //config: User '*' means 'any system user name is ok', //config: password of '*' means 'use system password for this user' //config: Examples: //config: /adm:toor:$1$P/eKnWXS$aI1aPGxT.dJD5SzqAKWrF0 //config: /adm:root:* //config: /wiki:*:* //config: //config:config FEATURE_HTTPD_CGI //config: bool "Support Common Gateway Interface (CGI)" //config: default y //config: depends on HTTPD //config: help //config: This option allows scripts and executables to be invoked //config: when specific URLs are requested. //config: //config:config FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR //config: bool "Support running scripts through an interpreter" //config: default y //config: depends on FEATURE_HTTPD_CGI //config: help //config: This option enables support for running scripts through an //config: interpreter. Turn this on if you want PHP scripts to work //config: properly. You need to supply an additional line in your //config: httpd.conf file: //config: *.php:/path/to/your/php //config: //config:config FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV //config: bool "Set REMOTE_PORT environment variable for CGI" //config: default y //config: depends on FEATURE_HTTPD_CGI //config: help //config: Use of this option can assist scripts in generating //config: references that contain a unique port number. //config: //config:config FEATURE_HTTPD_ENCODE_URL_STR //config: bool "Enable -e option (useful for CGIs written as shell scripts)" //config: default y //config: depends on HTTPD //config: help //config: This option allows html encoding of arbitrary strings for display //config: by the browser. Output goes to stdout. //config: For example, httpd -e "" produces //config: "<Hello World>". //config: //config:config FEATURE_HTTPD_ERROR_PAGES //config: bool "Support custom error pages" //config: default y //config: depends on HTTPD //config: help //config: This option allows you to define custom error pages in //config: the configuration file instead of the default HTTP status //config: error pages. For instance, if you add the line: //config: E404:/path/e404.html //config: in the config file, the server will respond the specified //config: '/path/e404.html' file instead of the terse '404 NOT FOUND' //config: message. //config: //config:config FEATURE_HTTPD_PROXY //config: bool "Support reverse proxy" //config: default y //config: depends on HTTPD //config: help //config: This option allows you to define URLs that will be forwarded //config: to another HTTP server. To setup add the following line to the //config: configuration file //config: P:/url/:http://hostname[:port]/new/path/ //config: Then a request to /url/myfile will be forwarded to //config: http://hostname[:port]/new/path/myfile. //config: //config:config FEATURE_HTTPD_GZIP //config: bool "Support GZIP content encoding" //config: default y //config: depends on HTTPD //config: help //config: Makes httpd send files using GZIP content encoding if the //config: client supports it and a pre-compressed .gz exists. //applet:IF_HTTPD(APPLET(httpd, BB_DIR_USR_SBIN, BB_SUID_DROP)) //kbuild:lib-$(CONFIG_HTTPD) += httpd.o //usage:#define httpd_trivial_usage //usage: "[-ifv[v]]" //usage: " [-c CONFFILE]" //usage: " [-p [IP:]PORT]" //usage: IF_FEATURE_HTTPD_SETUID(" [-u USER[:GRP]]") //usage: IF_FEATURE_HTTPD_BASIC_AUTH(" [-r REALM]") //usage: " [-h HOME]\n" //usage: "or httpd -d/-e" IF_FEATURE_HTTPD_AUTH_MD5("/-m") " STRING" //usage:#define httpd_full_usage "\n\n" //usage: "Listen for incoming HTTP requests\n" //usage: "\n -i Inetd mode" //usage: "\n -f Don't daemonize" //usage: "\n -v[v] Verbose" //usage: "\n -p [IP:]PORT Bind to IP:PORT (default *:80)" //usage: IF_FEATURE_HTTPD_SETUID( //usage: "\n -u USER[:GRP] Set uid/gid after binding to port") //usage: IF_FEATURE_HTTPD_BASIC_AUTH( //usage: "\n -r REALM Authentication Realm for Basic Authentication") //usage: "\n -h HOME Home directory (default .)" //usage: "\n -c FILE Configuration file (default {/etc,HOME}/httpd.conf)" //usage: IF_FEATURE_HTTPD_AUTH_MD5( //usage: "\n -m STRING MD5 crypt STRING") //usage: "\n -e STRING HTML encode STRING" //usage: "\n -d STRING URL decode STRING" /* TODO: use TCP_CORK, parse_config() */ #include "libbb.h" #include "common_bufsiz.h" #if ENABLE_PAM /* PAM may include . We may need to undefine bbox's stub define: */ # undef setlocale /* For some obscure reason, PAM is not in pam/xxx, but in security/xxx. * Apparently they like to confuse people. */ # include # include #endif #if ENABLE_FEATURE_USE_SENDFILE # include #endif #define DEBUG 0 #define IOBUF_SIZE 8192 #define MAX_HTTP_HEADERS_SIZE (32*1024) #define HEADER_READ_TIMEOUT 60 static const char DEFAULT_PATH_HTTPD_CONF[] ALIGN1 = "/etc"; static const char HTTPD_CONF[] ALIGN1 = "httpd.conf"; static const char HTTP_200[] ALIGN1 = "HTTP/1.0 200 OK\r\n"; static const char index_html[] ALIGN1 = "index.html"; typedef struct has_next_ptr { struct has_next_ptr *next; } has_next_ptr; /* Must have "next" as a first member */ typedef struct Htaccess { struct Htaccess *next; char *after_colon; char before_colon[1]; /* really bigger, must be last */ } Htaccess; /* Must have "next" as a first member */ typedef struct Htaccess_IP { struct Htaccess_IP *next; unsigned ip; unsigned mask; int allow_deny; } Htaccess_IP; /* Must have "next" as a first member */ typedef struct Htaccess_Proxy { struct Htaccess_Proxy *next; char *url_from; char *host_port; char *url_to; } Htaccess_Proxy; typedef enum CGI_type { CGI_NONE = 0, CGI_NORMAL, CGI_INDEX, CGI_INTERPRETER, } CGI_type; enum { HTTP_OK = 200, HTTP_PARTIAL_CONTENT = 206, HTTP_MOVED_TEMPORARILY = 302, HTTP_BAD_REQUEST = 400, /* malformed syntax */ HTTP_UNAUTHORIZED = 401, /* authentication needed, respond with auth hdr */ HTTP_NOT_FOUND = 404, HTTP_FORBIDDEN = 403, HTTP_REQUEST_TIMEOUT = 408, HTTP_NOT_IMPLEMENTED = 501, /* used for unrecognized requests */ HTTP_INTERNAL_SERVER_ERROR = 500, HTTP_ENTITY_TOO_LARGE = 413, HTTP_CONTINUE = 100, #if 0 /* future use */ HTTP_SWITCHING_PROTOCOLS = 101, HTTP_CREATED = 201, HTTP_ACCEPTED = 202, HTTP_NON_AUTHORITATIVE_INFO = 203, HTTP_NO_CONTENT = 204, HTTP_MULTIPLE_CHOICES = 300, HTTP_MOVED_PERMANENTLY = 301, HTTP_NOT_MODIFIED = 304, HTTP_PAYMENT_REQUIRED = 402, HTTP_BAD_GATEWAY = 502, HTTP_SERVICE_UNAVAILABLE = 503, /* overload, maintenance */ #endif }; static const uint16_t http_response_type[] ALIGN2 = { HTTP_OK, #if ENABLE_FEATURE_HTTPD_RANGES HTTP_PARTIAL_CONTENT, #endif HTTP_MOVED_TEMPORARILY, HTTP_REQUEST_TIMEOUT, HTTP_NOT_IMPLEMENTED, #if ENABLE_FEATURE_HTTPD_BASIC_AUTH HTTP_UNAUTHORIZED, #endif HTTP_NOT_FOUND, HTTP_BAD_REQUEST, HTTP_FORBIDDEN, HTTP_INTERNAL_SERVER_ERROR, HTTP_ENTITY_TOO_LARGE, #if 0 /* not implemented */ HTTP_CREATED, HTTP_ACCEPTED, HTTP_NO_CONTENT, HTTP_MULTIPLE_CHOICES, HTTP_MOVED_PERMANENTLY, HTTP_NOT_MODIFIED, HTTP_BAD_GATEWAY, HTTP_SERVICE_UNAVAILABLE, #endif }; static const struct { const char *name; const char *info; } http_response[ARRAY_SIZE(http_response_type)] = { { "OK", NULL }, #if ENABLE_FEATURE_HTTPD_RANGES { "Partial Content", NULL }, #endif { "Found", NULL }, { "Request Timeout", "No request appeared within 60 seconds" }, { "Not Implemented", "The requested method is not recognized" }, #if ENABLE_FEATURE_HTTPD_BASIC_AUTH { "Unauthorized", "" }, #endif { "Not Found", "The requested URL was not found" }, { "Bad Request", "Unsupported method" }, { "Forbidden", "" }, { "Internal Server Error", "Internal Server Error" }, { "Entity Too Large", "Entity Too Large" }, #if 0 /* not implemented */ { "Created" }, { "Accepted" }, { "No Content" }, { "Multiple Choices" }, { "Moved Permanently" }, { "Not Modified" }, { "Bad Gateway", "" }, { "Service Unavailable", "" }, #endif }; struct globals { int verbose; /* must be int (used by getopt32) */ smallint flg_deny_all; #if ENABLE_FEATURE_HTTPD_GZIP /* client can handle gzip / we are going to send gzip */ smallint content_gzip; #endif time_t last_mod; char *rmt_ip_str; /* for $REMOTE_ADDR and $REMOTE_PORT */ const char *bind_addr_or_port; char *g_query; const char *opt_c_configFile; const char *home_httpd; const char *index_page; const char *found_mime_type; const char *found_moved_temporarily; Htaccess_IP *ip_a_d; /* config allow/deny lines */ IF_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;) IF_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;) off_t file_size; /* -1 - unknown */ #if ENABLE_FEATURE_HTTPD_RANGES off_t range_start; off_t range_end; off_t range_len; #endif #if ENABLE_FEATURE_HTTPD_BASIC_AUTH Htaccess *g_auth; /* config user:password lines */ #endif Htaccess *mime_a; /* config mime types */ #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR Htaccess *script_i; /* config script interpreters */ #endif char *iobuf; /* [IOBUF_SIZE] */ #define hdr_buf bb_common_bufsiz1 #define sizeof_hdr_buf COMMON_BUFSIZE char *hdr_ptr; int hdr_cnt; #if ENABLE_FEATURE_HTTPD_ERROR_PAGES const char *http_error_page[ARRAY_SIZE(http_response_type)]; #endif #if ENABLE_FEATURE_HTTPD_PROXY Htaccess_Proxy *proxy; #endif }; #define G (*ptr_to_globals) #define verbose (G.verbose ) #define flg_deny_all (G.flg_deny_all ) #if ENABLE_FEATURE_HTTPD_GZIP # define content_gzip (G.content_gzip ) #else # define content_gzip 0 #endif #define bind_addr_or_port (G.bind_addr_or_port) #define g_query (G.g_query ) #define opt_c_configFile (G.opt_c_configFile ) #define home_httpd (G.home_httpd ) #define index_page (G.index_page ) #define found_mime_type (G.found_mime_type ) #define found_moved_temporarily (G.found_moved_temporarily) #define last_mod (G.last_mod ) #define ip_a_d (G.ip_a_d ) #define g_realm (G.g_realm ) #define remoteuser (G.remoteuser ) #define file_size (G.file_size ) #if ENABLE_FEATURE_HTTPD_RANGES #define range_start (G.range_start ) #define range_end (G.range_end ) #define range_len (G.range_len ) #else enum { range_start = -1, range_end = MAXINT(off_t) - 1, range_len = MAXINT(off_t), }; #endif #define rmt_ip_str (G.rmt_ip_str ) #define g_auth (G.g_auth ) #define mime_a (G.mime_a ) #define script_i (G.script_i ) #define iobuf (G.iobuf ) #define hdr_ptr (G.hdr_ptr ) #define hdr_cnt (G.hdr_cnt ) #define http_error_page (G.http_error_page ) #define proxy (G.proxy ) #define INIT_G() do { \ setup_common_bufsiz(); \ SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \ IF_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \ IF_FEATURE_HTTPD_RANGES(range_start = -1;) \ bind_addr_or_port = "80"; \ index_page = index_html; \ file_size = -1; \ } while (0) #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1) /* Prototypes */ enum { SEND_HEADERS = (1 << 0), SEND_BODY = (1 << 1), SEND_HEADERS_AND_BODY = SEND_HEADERS + SEND_BODY, }; static void send_file_and_exit(const char *url, int what) NORETURN; static void free_llist(has_next_ptr **pptr) { has_next_ptr *cur = *pptr; while (cur) { has_next_ptr *t = cur; cur = cur->next; free(t); } *pptr = NULL; } static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr) { free_llist((has_next_ptr**)pptr); } static ALWAYS_INLINE void free_Htaccess_IP_list(Htaccess_IP **pptr) { free_llist((has_next_ptr**)pptr); } /* Returns presumed mask width in bits or < 0 on error. * Updates strp, stores IP at provided pointer */ static int scan_ip(const char **strp, unsigned *ipp, unsigned char endc) { const char *p = *strp; int auto_mask = 8; unsigned ip = 0; int j; if (*p == '/') return -auto_mask; for (j = 0; j < 4; j++) { unsigned octet; if ((*p < '0' || *p > '9') && *p != '/' && *p) return -auto_mask; octet = 0; while (*p >= '0' && *p <= '9') { octet *= 10; octet += *p - '0'; if (octet > 255) return -auto_mask; p++; } if (*p == '.') p++; if (*p != '/' && *p) auto_mask += 8; ip = (ip << 8) | octet; } if (*p) { if (*p != endc) return -auto_mask; p++; if (*p == '\0') return -auto_mask; } *ipp = ip; *strp = p; return auto_mask; } /* Returns 0 on success. Stores IP and mask at provided pointers */ static int scan_ip_mask(const char *str, unsigned *ipp, unsigned *maskp) { int i; unsigned mask; char *p; i = scan_ip(&str, ipp, '/'); if (i < 0) return i; if (*str) { /* there is /xxx after dotted-IP address */ i = bb_strtou(str, &p, 10); if (*p == '.') { /* 'xxx' itself is dotted-IP mask, parse it */ /* (return 0 (success) only if it has N.N.N.N form) */ return scan_ip(&str, maskp, '\0') - 32; } if (*p) return -1; } if (i > 32) return -1; if (sizeof(unsigned) == 4 && i == 32) { /* mask >>= 32 below may not work */ mask = 0; } else { mask = 0xffffffff; mask >>= i; } /* i == 0 -> *maskp = 0x00000000 * i == 1 -> *maskp = 0x80000000 * i == 4 -> *maskp = 0xf0000000 * i == 31 -> *maskp = 0xfffffffe * i == 32 -> *maskp = 0xffffffff */ *maskp = (uint32_t)(~mask); return 0; } /* * Parse configuration file into in-memory linked list. * * Any previous IP rules are discarded. * If the flag argument is not SUBDIR_PARSE then all /path and mime rules * are also discarded. That is, previous settings are retained if flag is * SUBDIR_PARSE. * Error pages are only parsed on the main config file. * * path Path where to look for httpd.conf (without filename). * flag Type of the parse request. */ /* flag param: */ enum { FIRST_PARSE = 0, /* path will be "/etc" */ SIGNALED_PARSE = 1, /* path will be "/etc" */ SUBDIR_PARSE = 2, /* path will be derived from URL */ }; static void parse_conf(const char *path, int flag) { /* internally used extra flag state */ enum { TRY_CURDIR_PARSE = 3 }; FILE *f; const char *filename; char buf[160]; /* discard old rules */ free_Htaccess_IP_list(&ip_a_d); flg_deny_all = 0; /* retain previous auth and mime config only for subdir parse */ if (flag != SUBDIR_PARSE) { free_Htaccess_list(&mime_a); #if ENABLE_FEATURE_HTTPD_BASIC_AUTH free_Htaccess_list(&g_auth); #endif #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR free_Htaccess_list(&script_i); #endif } filename = opt_c_configFile; if (flag == SUBDIR_PARSE || filename == NULL) { filename = alloca(strlen(path) + sizeof(HTTPD_CONF) + 2); sprintf((char *)filename, "%s/%s", path, HTTPD_CONF); } while ((f = fopen_for_read(filename)) == NULL) { if (flag >= SUBDIR_PARSE) { /* SUBDIR or TRY_CURDIR */ /* config file not found, no changes to config */ return; } if (flag == FIRST_PARSE) { /* -c CONFFILE given, but CONFFILE doesn't exist? */ if (opt_c_configFile) bb_simple_perror_msg_and_die(opt_c_configFile); /* else: no -c, thus we looked at /etc/httpd.conf, * and it's not there. try ./httpd.conf: */ } flag = TRY_CURDIR_PARSE; filename = HTTPD_CONF; } #if ENABLE_FEATURE_HTTPD_BASIC_AUTH /* in "/file:user:pass" lines, we prepend path in subdirs */ if (flag != SUBDIR_PARSE) path = ""; #endif /* The lines can be: * * I:default_index_file * H:http_home * [AD]:IP[/mask] # allow/deny, * for wildcard * Ennn:error.html # error page for status nnn * P:/url:[http://]hostname[:port]/new/path # reverse proxy * .ext:mime/type # mime type * *.php:/path/php # run xxx.php through an interpreter * /file:user:pass # username and password */ while (fgets(buf, sizeof(buf), f) != NULL) { unsigned strlen_buf; unsigned char ch; char *after_colon; { /* remove all whitespace, and # comments */ char *p, *p0; p0 = buf; /* skip non-whitespace beginning. Often the whole line * is non-whitespace. We want this case to work fast, * without needless copying, therefore we don't merge * this operation into next while loop. */ while ((ch = *p0) != '\0' && ch != '\n' && ch != '#' && ch != ' ' && ch != '\t' ) { p0++; } p = p0; /* if we enter this loop, we have some whitespace. * discard it */ while (ch != '\0' && ch != '\n' && ch != '#') { if (ch != ' ' && ch != '\t') { *p++ = ch; } ch = *++p0; } *p = '\0'; strlen_buf = p - buf; if (strlen_buf == 0) continue; /* empty line */ } after_colon = strchr(buf, ':'); /* strange line? */ if (after_colon == NULL || *++after_colon == '\0') goto config_error; ch = (buf[0] & ~0x20); /* toupper if it's a letter */ if (ch == 'I') { if (index_page != index_html) free((char*)index_page); index_page = xstrdup(after_colon); continue; } /* do not allow jumping around using H in subdir's configs */ if (flag == FIRST_PARSE && ch == 'H') { home_httpd = xstrdup(after_colon); xchdir(home_httpd); continue; } if (ch == 'A' || ch == 'D') { Htaccess_IP *pip; if (*after_colon == '*') { if (ch == 'D') { /* memorize "deny all" */ flg_deny_all = 1; } /* skip assumed "A:*", it is a default anyway */ continue; } /* store "allow/deny IP/mask" line */ pip = xzalloc(sizeof(*pip)); if (scan_ip_mask(after_colon, &pip->ip, &pip->mask)) { /* IP{/mask} syntax error detected, protect all */ ch = 'D'; pip->mask = 0; } pip->allow_deny = ch; if (ch == 'D') { /* Deny:from_IP - prepend */ pip->next = ip_a_d; ip_a_d = pip; } else { /* A:from_IP - append (thus all D's precedes A's) */ Htaccess_IP *prev_IP = ip_a_d; if (prev_IP == NULL) { ip_a_d = pip; } else { while (prev_IP->next) prev_IP = prev_IP->next; prev_IP->next = pip; } } continue; } #if ENABLE_FEATURE_HTTPD_ERROR_PAGES if (flag == FIRST_PARSE && ch == 'E') { unsigned i; int status = atoi(buf + 1); /* error status code */ if (status < HTTP_CONTINUE) { goto config_error; } /* then error page; find matching status */ for (i = 0; i < ARRAY_SIZE(http_response_type); i++) { if (http_response_type[i] == status) { /* We chdir to home_httpd, thus no need to * concat_path_file(home_httpd, after_colon) * here */ http_error_page[i] = xstrdup(after_colon); break; } } continue; } #endif #if ENABLE_FEATURE_HTTPD_PROXY if (flag == FIRST_PARSE && ch == 'P') { /* P:/url:[http://]hostname[:port]/new/path */ char *url_from, *host_port, *url_to; Htaccess_Proxy *proxy_entry; url_from = after_colon; host_port = strchr(after_colon, ':'); if (host_port == NULL) { goto config_error; } *host_port++ = '\0'; if (is_prefixed_with(host_port, "http://")) host_port += 7; if (*host_port == '\0') { goto config_error; } url_to = strchr(host_port, '/'); if (url_to == NULL) { goto config_error; } *url_to = '\0'; proxy_entry = xzalloc(sizeof(*proxy_entry)); proxy_entry->url_from = xstrdup(url_from); proxy_entry->host_port = xstrdup(host_port); *url_to = '/'; proxy_entry->url_to = xstrdup(url_to); proxy_entry->next = proxy; proxy = proxy_entry; continue; } #endif /* the rest of directives are non-alphabetic, * must avoid using "toupper'ed" ch */ ch = buf[0]; if (ch == '.' /* ".ext:mime/type" */ #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR || (ch == '*' && buf[1] == '.') /* "*.php:/path/php" */ #endif ) { char *p; Htaccess *cur; cur = xzalloc(sizeof(*cur) /* includes space for NUL */ + strlen_buf); strcpy(cur->before_colon, buf); p = cur->before_colon + (after_colon - buf); p[-1] = '\0'; cur->after_colon = p; if (ch == '.') { /* .mime line: prepend to mime_a list */ cur->next = mime_a; mime_a = cur; } #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR else { /* script interpreter line: prepend to script_i list */ cur->next = script_i; script_i = cur; } #endif continue; } #if ENABLE_FEATURE_HTTPD_BASIC_AUTH if (ch == '/') { /* "/file:user:pass" */ char *p; Htaccess *cur; unsigned file_len; /* note: path is "" unless we are in SUBDIR parse, * otherwise it does NOT start with "/" */ cur = xzalloc(sizeof(*cur) /* includes space for NUL */ + 1 + strlen(path) + strlen_buf ); /* form "/path/file" */ sprintf(cur->before_colon, "/%s%.*s", path, (int) (after_colon - buf - 1), /* includes "/", but not ":" */ buf); /* canonicalize it */ p = bb_simplify_abs_path_inplace(cur->before_colon); file_len = p - cur->before_colon; /* add "user:pass" after NUL */ strcpy(++p, after_colon); cur->after_colon = p; /* insert cur into g_auth */ /* g_auth is sorted by decreased filename length */ { Htaccess *auth, **authp; authp = &g_auth; while ((auth = *authp) != NULL) { if (file_len >= strlen(auth->before_colon)) { /* insert cur before auth */ cur->next = auth; break; } authp = &auth->next; } *authp = cur; } continue; } #endif /* BASIC_AUTH */ /* the line is not recognized */ config_error: bb_error_msg("config error '%s' in '%s'", buf, filename); } /* while (fgets) */ fclose(f); } #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR /* * Given a string, html-encode special characters. * This is used for the -e command line option to provide an easy way * for scripts to encode result data without confusing browsers. The * returned string pointer is memory allocated by malloc(). * * Returns a pointer to the encoded string (malloced). */ static char *encodeString(const char *string) { /* take the simple route and encode everything */ /* could possibly scan once to get length. */ int len = strlen(string); char *out = xmalloc(len * 6 + 1); char *p = out; char ch; while ((ch = *string++) != '\0') { /* very simple check for what to encode */ if (isalnum(ch)) *p++ = ch; else p += sprintf(p, "&#%u;", (unsigned char) ch); } *p = '\0'; return out; } #endif #if ENABLE_FEATURE_HTTPD_BASIC_AUTH /* * Decode a base64 data stream as per rfc1521. * Note that the rfc states that non base64 chars are to be ignored. * Since the decode always results in a shorter size than the input, * it is OK to pass the input arg as an output arg. * Parameter: a pointer to a base64 encoded string. * Decoded data is stored in-place. */ static void decodeBase64(char *Data) { const unsigned char *in = (const unsigned char *)Data; /* The decoded size will be at most 3/4 the size of the encoded */ unsigned ch = 0; int i = 0; while (*in) { int t = *in++; if (t >= '0' && t <= '9') t = t - '0' + 52; else if (t >= 'A' && t <= 'Z') t = t - 'A'; else if (t >= 'a' && t <= 'z') t = t - 'a' + 26; else if (t == '+') t = 62; else if (t == '/') t = 63; else if (t == '=') t = 0; else continue; ch = (ch << 6) | t; i++; if (i == 4) { *Data++ = (char) (ch >> 16); *Data++ = (char) (ch >> 8); *Data++ = (char) ch; i = 0; } } *Data = '\0'; } #endif /* * Create a listen server socket on the designated port. */ static int openServer(void) { unsigned n = bb_strtou(bind_addr_or_port, NULL, 10); if (!errno && n && n <= 0xffff) n = create_and_bind_stream_or_die(NULL, n); else n = create_and_bind_stream_or_die(bind_addr_or_port, 80); xlisten(n, 9); return n; } /* * Log the connection closure and exit. */ static void log_and_exit(void) NORETURN; static void log_and_exit(void) { /* Paranoia. IE said to be buggy. It may send some extra data * or be confused by us just exiting without SHUT_WR. Oh well. */ shutdown(1, SHUT_WR); /* Why?? (this also messes up stdin when user runs httpd -i from terminal) ndelay_on(0); while (read(STDIN_FILENO, iobuf, IOBUF_SIZE) > 0) continue; */ if (verbose > 2) bb_error_msg("closed"); _exit(xfunc_error_retval); } /* * Create and send HTTP response headers. * The arguments are combined and sent as one write operation. Note that * IE will puke big-time if the headers are not sent in one packet and the * second packet is delayed for any reason. * responseNum - the result code to send. */ static void send_headers(unsigned responseNum) { static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT"; /* Fixed size 29-byte string. Example: Sun, 06 Nov 1994 08:49:37 GMT */ char date_str[40]; /* using a bit larger buffer to paranoia reasons */ struct tm tm; const char *responseString = ""; const char *infoString = NULL; #if ENABLE_FEATURE_HTTPD_ERROR_PAGES const char *error_page = NULL; #endif unsigned len; unsigned i; time_t timer = time(NULL); for (i = 0; i < ARRAY_SIZE(http_response_type); i++) { if (http_response_type[i] == responseNum) { responseString = http_response[i].name; infoString = http_response[i].info; #if ENABLE_FEATURE_HTTPD_ERROR_PAGES error_page = http_error_page[i]; #endif break; } } if (verbose) bb_error_msg("response:%u", responseNum); /* We use sprintf, not snprintf (it's less code). * iobuf[] is several kbytes long and all headers we generate * always fit into those kbytes. */ strftime(date_str, sizeof(date_str), RFC1123FMT, gmtime_r(&timer, &tm)); /* ^^^ using gmtime_r() instead of gmtime() to not use static data */ len = sprintf(iobuf, "HTTP/1.0 %u %s\r\n" "Date: %s\r\n" "Connection: close\r\n", responseNum, responseString, date_str ); if (responseNum != HTTP_OK || found_mime_type) { len += sprintf(iobuf + len, "Content-type: %s\r\n", /* if it's error message, then it's HTML */ (responseNum != HTTP_OK ? "text/html" : found_mime_type) ); } #if ENABLE_FEATURE_HTTPD_BASIC_AUTH if (responseNum == HTTP_UNAUTHORIZED) { len += sprintf(iobuf + len, "WWW-Authenticate: Basic realm=\"%.999s\"\r\n", g_realm /* %.999s protects from overflowing iobuf[] */ ); } #endif if (responseNum == HTTP_MOVED_TEMPORARILY) { /* Responding to "GET /dir" with * "HTTP/1.0 302 Found" "Location: /dir/" * - IOW, asking them to repeat with a slash. * Here, overflow IS possible, can't use sprintf: * mkdir test * python -c 'print("get /test?" + ("x" * 8192))' | busybox httpd -i -h . */ len += snprintf(iobuf + len, IOBUF_SIZE-3 - len, "Location: %s/%s%s\r\n", found_moved_temporarily, (g_query ? "?" : ""), (g_query ? g_query : "") ); if (len > IOBUF_SIZE-3) len = IOBUF_SIZE-3; } #if ENABLE_FEATURE_HTTPD_ERROR_PAGES if (error_page && access(error_page, R_OK) == 0) { iobuf[len++] = '\r'; iobuf[len++] = '\n'; if (DEBUG) { iobuf[len] = '\0'; fprintf(stderr, "headers: '%s'\n", iobuf); } full_write(STDOUT_FILENO, iobuf, len); if (DEBUG) fprintf(stderr, "writing error page: '%s'\n", error_page); return send_file_and_exit(error_page, SEND_BODY); } #endif if (file_size != -1) { /* file */ strftime(date_str, sizeof(date_str), RFC1123FMT, gmtime_r(&last_mod, &tm)); #if ENABLE_FEATURE_HTTPD_RANGES if (responseNum == HTTP_PARTIAL_CONTENT) { len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"u-%"OFF_FMT"u/%"OFF_FMT"u\r\n", range_start, range_end, file_size ); file_size = range_end - range_start + 1; } #endif //RFC 2616 4.4 Message Length // The transfer-length of a message is the length of the message-body as // it appears in the message; that is, after any transfer-codings have // been applied. When a message-body is included with a message, the // transfer-length of that body is determined by one of the following // (in order of precedence): // 1.Any response message which "MUST NOT" include a message-body (such // as the 1xx, 204, and 304 responses and any response to a HEAD // request) is always terminated by the first empty line after the // header fields, regardless of the entity-header fields present in // the message. // 2.If a Transfer-Encoding header field (section 14.41) is present and // has any value other than "identity", then the transfer-length is // defined by use of the "chunked" transfer-coding (section 3.6), // unless the message is terminated by closing the connection. // 3.If a Content-Length header field (section 14.13) is present, its // decimal value in OCTETs represents both the entity-length and the // transfer-length. The Content-Length header field MUST NOT be sent // if these two lengths are different (i.e., if a Transfer-Encoding // header field is present). If a message is received with both a // Transfer-Encoding header field and a Content-Length header field, // the latter MUST be ignored. // 4.If the message uses the media type "multipart/byteranges" ... // 5.By the server closing the connection. // // (NB: standards do not define "Transfer-Length:" _header_, // transfer-length above is just a concept). len += sprintf(iobuf + len, #if ENABLE_FEATURE_HTTPD_RANGES "Accept-Ranges: bytes\r\n" #endif "Last-Modified: %s\r\n" /* Because of 4.4 (5), we can forgo sending of "Content-Length" * since we close connection afterwards, but it helps clients * to e.g. estimate download times, show progress bars etc. * Theoretically we should not send it if page is compressed, * but de-facto standard is to send it (see comment below). */ "Content-Length: %"OFF_FMT"u\r\n", date_str, file_size ); } /* This should be "Transfer-Encoding", not "Content-Encoding": * "data is compressed for transfer", not "data is an archive". * But many clients were not handling "Transfer-Encoding" correctly * (they were not uncompressing gzipped pages, tried to show * raw compressed data), and servers worked around it by using * "Content-Encoding" instead... and this become de-facto standard. * https://bugzilla.mozilla.org/show_bug.cgi?id=68517 * https://bugs.chromium.org/p/chromium/issues/detail?id=94730 */ if (content_gzip) len += sprintf(iobuf + len, "Content-Encoding: gzip\r\n"); iobuf[len++] = '\r'; iobuf[len++] = '\n'; if (infoString) { len += sprintf(iobuf + len, "%u %s\n" "

%u %s

\n" "%s\n" "\n", responseNum, responseString, responseNum, responseString, infoString ); } if (DEBUG) { iobuf[len] = '\0'; fprintf(stderr, "headers: '%s'\n", iobuf); } if (full_write(STDOUT_FILENO, iobuf, len) != len) { if (verbose > 1) bb_perror_msg("error"); log_and_exit(); } } static void send_headers_and_exit(int responseNum) NORETURN; static void send_headers_and_exit(int responseNum) { IF_FEATURE_HTTPD_GZIP(content_gzip = 0;) send_headers(responseNum); log_and_exit(); } /* * Read from the socket until '\n' or EOF. * '\r' chars are removed. * '\n' is replaced with NUL. * Return number of characters read or 0 if nothing is read * ('\r' and '\n' are not counted). * Data is returned in iobuf. */ static unsigned get_line(void) { unsigned count; char c; count = 0; while (1) { if (hdr_cnt <= 0) { alarm(HEADER_READ_TIMEOUT); hdr_cnt = safe_read(STDIN_FILENO, hdr_buf, sizeof_hdr_buf); if (hdr_cnt <= 0) goto ret; hdr_ptr = hdr_buf; } hdr_cnt--; c = *hdr_ptr++; if (c == '\r') continue; if (c == '\n') break; iobuf[count] = c; if (count < (IOBUF_SIZE - 1)) /* check overflow */ count++; } ret: iobuf[count] = '\0'; return count; } #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY /* gcc 4.2.1 fares better with NOINLINE */ static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) NORETURN; static NOINLINE void cgi_io_loop_and_exit(int fromCgi_rd, int toCgi_wr, int post_len) { enum { FROM_CGI = 1, TO_CGI = 2 }; /* indexes in pfd[] */ struct pollfd pfd[3]; int out_cnt; /* we buffer a bit of initial CGI output */ int count; /* iobuf is used for CGI -> network data, * hdr_buf is for network -> CGI data (POSTDATA) */ /* If CGI dies, we still want to correctly finish reading its output * and send it to the peer. So please no SIGPIPEs! */ signal(SIGPIPE, SIG_IGN); // We inconsistently handle a case when more POSTDATA from network // is coming than we expected. We may give *some part* of that // extra data to CGI. //if (hdr_cnt > post_len) { // /* We got more POSTDATA from network than we expected */ // hdr_cnt = post_len; //} post_len -= hdr_cnt; /* post_len - number of POST bytes not yet read from network */ /* NB: breaking out of this loop jumps to log_and_exit() */ out_cnt = 0; pfd[FROM_CGI].fd = fromCgi_rd; pfd[FROM_CGI].events = POLLIN; pfd[TO_CGI].fd = toCgi_wr; while (1) { /* Note: even pfd[0].events == 0 won't prevent * revents == POLLHUP|POLLERR reports from closed stdin. * Setting fd to -1 works: */ pfd[0].fd = -1; pfd[0].events = POLLIN; pfd[0].revents = 0; /* probably not needed, paranoia */ /* We always poll this fd, thus kernel always sets revents: */ /*pfd[FROM_CGI].events = POLLIN; - moved out of loop */ /*pfd[FROM_CGI].revents = 0; - not needed */ /* gcc-4.8.0 still doesnt fill two shorts with one insn :( */ /* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47059 */ /* hopefully one day it will... */ pfd[TO_CGI].events = POLLOUT; pfd[TO_CGI].revents = 0; /* needed! */ if (toCgi_wr && hdr_cnt <= 0) { if (post_len > 0) { /* Expect more POST data from network */ pfd[0].fd = 0; } else { /* post_len <= 0 && hdr_cnt <= 0: * no more POST data to CGI, * let CGI see EOF on CGI's stdin */ if (toCgi_wr != fromCgi_rd) close(toCgi_wr); toCgi_wr = 0; } } /* Now wait on the set of sockets */ count = safe_poll(pfd, hdr_cnt > 0 ? TO_CGI+1 : FROM_CGI+1, -1); if (count <= 0) { #if 0 if (safe_waitpid(pid, &status, WNOHANG) <= 0) { /* Weird. CGI didn't exit and no fd's * are ready, yet poll returned?! */ continue; } if (DEBUG && WIFEXITED(status)) bb_error_msg("CGI exited, status=%u", WEXITSTATUS(status)); if (DEBUG && WIFSIGNALED(status)) bb_error_msg("CGI killed, signal=%u", WTERMSIG(status)); #endif break; } if (pfd[TO_CGI].revents) { /* hdr_cnt > 0 here due to the way poll() called */ /* Have data from peer and can write to CGI */ count = safe_write(toCgi_wr, hdr_ptr, hdr_cnt); /* Doesn't happen, we dont use nonblocking IO here *if (count < 0 && errno == EAGAIN) { * ... *} else */ if (count > 0) { hdr_ptr += count; hdr_cnt -= count; } else { /* EOF/broken pipe to CGI, stop piping POST data */ hdr_cnt = post_len = 0; } } if (pfd[0].revents) { /* post_len > 0 && hdr_cnt == 0 here */ /* We expect data, prev data portion is eaten by CGI * and there *is* data to read from the peer * (POSTDATA) */ //count = post_len > (int)sizeof_hdr_buf ? (int)sizeof_hdr_buf : post_len; //count = safe_read(STDIN_FILENO, hdr_buf, count); count = safe_read(STDIN_FILENO, hdr_buf, sizeof_hdr_buf); if (count > 0) { hdr_cnt = count; hdr_ptr = hdr_buf; post_len -= count; } else { /* no more POST data can be read */ post_len = 0; } } if (pfd[FROM_CGI].revents) { /* There is something to read from CGI */ char *rbuf = iobuf; /* Are we still buffering CGI output? */ if (out_cnt >= 0) { /* HTTP_200[] has single "\r\n" at the end. * According to http://hoohoo.ncsa.uiuc.edu/cgi/out.html, * CGI scripts MUST send their own header terminated by * empty line, then data. That's why we have only one * pair here. We will output "200 OK" line * if needed, but CGI still has to provide blank line * between header and body */ /* Must use safe_read, not full_read, because * CGI may output a few first bytes and then wait * for POSTDATA without closing stdout. * With full_read we may wait here forever. */ count = safe_read(fromCgi_rd, rbuf + out_cnt, IOBUF_SIZE - 8); if (count <= 0) { /* eof (or error) and there was no "HTTP", * send "HTTP/1.0 200 OK\r\n", then send received data */ if (out_cnt) { full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1); full_write(STDOUT_FILENO, rbuf, out_cnt); } break; /* CGI stdout is closed, exiting */ } out_cnt += count; count = 0; /* "Status" header format is: "Status: 302 Redirected\r\n" */ if (out_cnt >= 8 && memcmp(rbuf, "Status: ", 8) == 0) { /* send "HTTP/1.0 " */ if (full_write(STDOUT_FILENO, HTTP_200, 9) != 9) break; /* skip "Status: " (including space, sending "HTTP/1.0 NNN" is wrong) */ rbuf += 8; count = out_cnt - 8; out_cnt = -1; /* buffering off */ } else if (out_cnt >= 4) { /* Did CGI add "HTTP"? */ if (memcmp(rbuf, HTTP_200, 4) != 0) { /* there is no "HTTP", do it ourself */ if (full_write(STDOUT_FILENO, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1) break; } /* Commented out: if (!strstr(rbuf, "ontent-")) { full_write(s, "Content-type: text/plain\r\n\r\n", 28); } * Counter-example of valid CGI without Content-type: * echo -en "HTTP/1.0 302 Found\r\n" * echo -en "Location: http://www.busybox.net\r\n" * echo -en "\r\n" */ count = out_cnt; out_cnt = -1; /* buffering off */ } } else { count = safe_read(fromCgi_rd, rbuf, IOBUF_SIZE); if (count <= 0) break; /* eof (or error) */ } if (full_write(STDOUT_FILENO, rbuf, count) != count) break; if (DEBUG) fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf); } /* if (pfd[FROM_CGI].revents) */ } /* while (1) */ log_and_exit(); } #endif #if ENABLE_FEATURE_HTTPD_CGI static void setenv1(const char *name, const char *value) { setenv(name, value ? value : "", 1); } /* * Spawn CGI script, forward CGI's stdin/out <=> network * * Environment variables are set up and the script is invoked with pipes * for stdin/stdout. If a POST is being done the script is fed the POST * data in addition to setting the QUERY_STRING variable (for GETs or POSTs). * * Parameters: * const char *url The requested URL (with leading /). * const char *orig_uri The original URI before rewriting (if any) * int post_len Length of the POST body. */ static void send_cgi_and_exit( const char *url, const char *orig_uri, const char *request, int post_len) NORETURN; static void send_cgi_and_exit( const char *url, const char *orig_uri, const char *request, int post_len) { struct fd_pair fromCgi; /* CGI -> httpd pipe */ struct fd_pair toCgi; /* httpd -> CGI pipe */ char *script, *last_slash; int pid; /* Make a copy. NB: caller guarantees: * url[0] == '/', url[1] != '/' */ url = xstrdup(url); /* * We are mucking with environment _first_ and then vfork/exec, * this allows us to use vfork safely. Parent doesn't care about * these environment changes anyway. */ /* Check for [dirs/]script.cgi/PATH_INFO */ last_slash = script = (char*)url; while ((script = strchr(script + 1, '/')) != NULL) { int dir; *script = '\0'; dir = is_directory(url + 1, /*followlinks:*/ 1); *script = '/'; if (!dir) { /* not directory, found script.cgi/PATH_INFO */ break; } /* is directory, find next '/' */ last_slash = script; } setenv1("PATH_INFO", script); /* set to /PATH_INFO or "" */ setenv1("REQUEST_METHOD", request); if (g_query) { putenv(xasprintf("%s=%s?%s", "REQUEST_URI", orig_uri, g_query)); } else { setenv1("REQUEST_URI", orig_uri); } if (script != NULL) *script = '\0'; /* cut off /PATH_INFO */ /* SCRIPT_FILENAME is required by PHP in CGI mode */ if (home_httpd[0] == '/') { char *fullpath = concat_path_file(home_httpd, url); setenv1("SCRIPT_FILENAME", fullpath); } /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */ setenv1("SCRIPT_NAME", url); /* http://hoohoo.ncsa.uiuc.edu/cgi/env.html: * QUERY_STRING: The information which follows the ? in the URL * which referenced this script. This is the query information. * It should not be decoded in any fashion. This variable * should always be set when there is query information, * regardless of command line decoding. */ /* (Older versions of bbox seem to do some decoding) */ setenv1("QUERY_STRING", g_query); putenv((char*)"SERVER_SOFTWARE=busybox httpd/"BB_VER); putenv((char*)"SERVER_PROTOCOL=HTTP/1.0"); putenv((char*)"GATEWAY_INTERFACE=CGI/1.1"); /* Having _separate_ variables for IP and port defeats * the purpose of having socket abstraction. Which "port" * are you using on Unix domain socket? * IOW - REMOTE_PEER="1.2.3.4:56" makes much more sense. * Oh well... */ { char *p = rmt_ip_str ? rmt_ip_str : (char*)""; char *cp = strrchr(p, ':'); if (ENABLE_FEATURE_IPV6 && cp && strchr(cp, ']')) cp = NULL; if (cp) *cp = '\0'; /* delete :PORT */ setenv1("REMOTE_ADDR", p); if (cp) { *cp = ':'; #if ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV setenv1("REMOTE_PORT", cp + 1); #endif } } if (post_len) putenv(xasprintf("CONTENT_LENGTH=%u", post_len)); #if ENABLE_FEATURE_HTTPD_BASIC_AUTH if (remoteuser) { setenv1("REMOTE_USER", remoteuser); putenv((char*)"AUTH_TYPE=Basic"); } #endif /* setenv1("SERVER_NAME", safe_gethostname()); - don't do this, * just run "env SERVER_NAME=xyz httpd ..." instead */ xpiped_pair(fromCgi); xpiped_pair(toCgi); pid = vfork(); if (pid < 0) { /* TODO: log perror? */ log_and_exit(); } if (pid == 0) { /* Child process */ char *argv[3]; xfunc_error_retval = 242; /* NB: close _first_, then move fds! */ close(toCgi.wr); close(fromCgi.rd); xmove_fd(toCgi.rd, 0); /* replace stdin with the pipe */ xmove_fd(fromCgi.wr, 1); /* replace stdout with the pipe */ /* User seeing stderr output can be a security problem. * If CGI really wants that, it can always do dup itself. */ /* dup2(1, 2); */ /* Chdiring to script's dir */ script = last_slash; if (script != url) { /* paranoia */ *script = '\0'; if (chdir(url + 1) != 0) { bb_perror_msg("can't change directory to '%s'", url + 1); goto error_execing_cgi; } // not needed: *script = '/'; } script++; /* set argv[0] to name without path */ argv[0] = script; argv[1] = NULL; #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR { char *suffix = strrchr(script, '.'); if (suffix) { Htaccess *cur; for (cur = script_i; cur; cur = cur->next) { if (strcmp(cur->before_colon + 1, suffix) == 0) { /* found interpreter name */ argv[0] = cur->after_colon; argv[1] = script; argv[2] = NULL; break; } } } } #endif /* restore default signal dispositions for CGI process */ bb_signals(0 | (1 << SIGCHLD) | (1 << SIGPIPE) | (1 << SIGHUP) , SIG_DFL); /* _NOT_ execvp. We do not search PATH. argv[0] is a filename * without any dir components and will only match a file * in the current directory */ execv(argv[0], argv); if (verbose) bb_perror_msg("can't execute '%s'", argv[0]); error_execing_cgi: /* send to stdout * (we are CGI here, our stdout is pumped to the net) */ send_headers_and_exit(HTTP_NOT_FOUND); } /* end child */ /* Parent process */ /* Restore variables possibly changed by child */ xfunc_error_retval = 0; /* Pump data */ close(fromCgi.wr); close(toCgi.rd); cgi_io_loop_and_exit(fromCgi.rd, toCgi.wr, post_len); } #endif /* FEATURE_HTTPD_CGI */ /* * Send a file response to a HTTP request, and exit * * Parameters: * const char *url The requested URL (with leading /). * what What to send (headers/body/both). */ static NOINLINE void send_file_and_exit(const char *url, int what) { char *suffix; int fd; ssize_t count; if (content_gzip) { /* does .gz exist? Then use it instead */ char *gzurl = xasprintf("%s.gz", url); fd = open(gzurl, O_RDONLY); free(gzurl); if (fd != -1) { struct stat sb; fstat(fd, &sb); file_size = sb.st_size; last_mod = sb.st_mtime; } else { IF_FEATURE_HTTPD_GZIP(content_gzip = 0;) fd = open(url, O_RDONLY); } } else { fd = open(url, O_RDONLY); } if (fd < 0) { if (DEBUG) bb_perror_msg("can't open '%s'", url); /* Error pages are sent by using send_file_and_exit(SEND_BODY). * IOW: it is unsafe to call send_headers_and_exit * if what is SEND_BODY! Can recurse! */ if (what != SEND_BODY) send_headers_and_exit(HTTP_NOT_FOUND); log_and_exit(); } /* If you want to know about EPIPE below * (happens if you abort downloads from local httpd): */ signal(SIGPIPE, SIG_IGN); /* If not found, default is to not send "Content-type:" */ /*found_mime_type = NULL; - already is */ suffix = strrchr(url, '.'); if (suffix) { static const char suffixTable[] ALIGN1 = /* Shorter suffix must be first: * ".html.htm" will fail for ".htm" */ ".txt.h.c.cc.cpp\0" "text/plain\0" /* .htm line must be after .h line */ ".htm.html\0" "text/html\0" ".jpg.jpeg\0" "image/jpeg\0" ".gif\0" "image/gif\0" ".png\0" "image/png\0" ".svg\0" "image/svg+xml\0" /* .css line must be after .c line */ ".css\0" "text/css\0" ".js\0" "application/x-javascript\0" ".wav\0" "audio/wav\0" ".avi\0" "video/x-msvideo\0" ".qt.mov\0" "video/quicktime\0" ".mpe.mpeg\0" "video/mpeg\0" ".mid.midi\0" "audio/midi\0" ".mp3\0" "audio/mpeg\0" #if 0 /* unpopular */ ".au\0" "audio/basic\0" ".pac\0" "application/x-ns-proxy-autoconfig\0" ".vrml.wrl\0" "model/vrml\0" #endif /* compiler adds another "\0" here */ ; Htaccess *cur; /* Examine built-in table */ const char *table = suffixTable; const char *table_next; for (; *table; table = table_next) { const char *try_suffix; const char *mime_type; mime_type = table + strlen(table) + 1; table_next = mime_type + strlen(mime_type) + 1; try_suffix = strstr(table, suffix); if (!try_suffix) continue; try_suffix += strlen(suffix); if (*try_suffix == '\0' || *try_suffix == '.') { found_mime_type = mime_type; break; } /* Example: strstr(table, ".av") != NULL, but it * does not match ".avi" after all and we end up here. * The table is arranged so that in this case we know * that it can't match anything in the following lines, * and we stop the search: */ break; } /* ...then user's table */ for (cur = mime_a; cur; cur = cur->next) { if (strcmp(cur->before_colon, suffix) == 0) { found_mime_type = cur->after_colon; break; } } } if (DEBUG) bb_error_msg("sending file '%s' content-type: %s", url, found_mime_type); #if ENABLE_FEATURE_HTTPD_RANGES if (what == SEND_BODY /* err pages and ranges don't mix */ || content_gzip /* we are sending compressed page: can't do ranges */ ///why? ) { range_start = -1; } range_len = MAXINT(off_t); if (range_start >= 0) { if (!range_end || range_end > file_size - 1) { range_end = file_size - 1; } if (range_end < range_start || lseek(fd, range_start, SEEK_SET) != range_start ) { lseek(fd, 0, SEEK_SET); range_start = -1; } else { range_len = range_end - range_start + 1; send_headers(HTTP_PARTIAL_CONTENT); what = SEND_BODY; } } #endif if (what & SEND_HEADERS) send_headers(HTTP_OK); #if ENABLE_FEATURE_USE_SENDFILE { off_t offset = range_start; while (1) { /* sz is rounded down to 64k */ ssize_t sz = MAXINT(ssize_t) - 0xffff; IF_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;) count = sendfile(STDOUT_FILENO, fd, &offset, sz); if (count < 0) { if (offset == range_start) break; /* fall back to read/write loop */ goto fin; } IF_FEATURE_HTTPD_RANGES(range_len -= count;) if (count == 0 || range_len == 0) log_and_exit(); } } #endif while ((count = safe_read(fd, iobuf, IOBUF_SIZE)) > 0) { ssize_t n; IF_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;) n = full_write(STDOUT_FILENO, iobuf, count); if (count != n) break; IF_FEATURE_HTTPD_RANGES(range_len -= count;) if (range_len == 0) break; } if (count < 0) { IF_FEATURE_USE_SENDFILE(fin:) if (verbose > 1) bb_perror_msg("error"); } log_and_exit(); } static void if_ip_denied_send_HTTP_FORBIDDEN_and_exit(unsigned remote_ip) { Htaccess_IP *cur; for (cur = ip_a_d; cur; cur = cur->next) { #if DEBUG fprintf(stderr, "checkPermIP: '%s' ? '%u.%u.%u.%u/%u.%u.%u.%u'\n", rmt_ip_str, (unsigned char)(cur->ip >> 24), (unsigned char)(cur->ip >> 16), (unsigned char)(cur->ip >> 8), (unsigned char)(cur->ip), (unsigned char)(cur->mask >> 24), (unsigned char)(cur->mask >> 16), (unsigned char)(cur->mask >> 8), (unsigned char)(cur->mask) ); #endif if ((remote_ip & cur->mask) == cur->ip) { if (cur->allow_deny == 'A') return; send_headers_and_exit(HTTP_FORBIDDEN); } } if (flg_deny_all) /* depends on whether we saw "D:*" */ send_headers_and_exit(HTTP_FORBIDDEN); } #if ENABLE_FEATURE_HTTPD_BASIC_AUTH # if ENABLE_PAM struct pam_userinfo { const char *name; const char *pw; }; static int pam_talker(int num_msg, const struct pam_message **msg, struct pam_response **resp, void *appdata_ptr) { int i; struct pam_userinfo *userinfo = (struct pam_userinfo *) appdata_ptr; struct pam_response *response; if (!resp || !msg || !userinfo) return PAM_CONV_ERR; /* allocate memory to store response */ response = xzalloc(num_msg * sizeof(*response)); /* copy values */ for (i = 0; i < num_msg; i++) { const char *s; switch (msg[i]->msg_style) { case PAM_PROMPT_ECHO_ON: s = userinfo->name; break; case PAM_PROMPT_ECHO_OFF: s = userinfo->pw; break; case PAM_ERROR_MSG: case PAM_TEXT_INFO: s = ""; break; default: free(response); return PAM_CONV_ERR; } response[i].resp = xstrdup(s); if (PAM_SUCCESS != 0) response[i].resp_retcode = PAM_SUCCESS; } *resp = response; return PAM_SUCCESS; } # endif /* * Config file entries are of the form "/::". * If config file has no prefix match for path, access is allowed. * * path The file path * user_and_passwd "user:passwd" to validate * * Returns 1 if user_and_passwd is OK. */ static int check_user_passwd(const char *path, char *user_and_passwd) { Htaccess *cur; const char *prev = NULL; for (cur = g_auth; cur; cur = cur->next) { const char *dir_prefix; size_t len; int r; dir_prefix = cur->before_colon; /* WHY? */ /* If already saw a match, don't accept other different matches */ if (prev && strcmp(prev, dir_prefix) != 0) continue; if (DEBUG) fprintf(stderr, "checkPerm: '%s' ? '%s'\n", dir_prefix, user_and_passwd); /* If it's not a prefix match, continue searching */ len = strlen(dir_prefix); if (len != 1 /* dir_prefix "/" matches all, don't need to check */ && (strncmp(dir_prefix, path, len) != 0 || (path[len] != '/' && path[len] != '\0') ) ) { continue; } /* Path match found */ prev = dir_prefix; if (ENABLE_FEATURE_HTTPD_AUTH_MD5) { char *colon_after_user; const char *passwd; # if ENABLE_FEATURE_SHADOWPASSWDS && !ENABLE_PAM char sp_buf[256]; # endif colon_after_user = strchr(user_and_passwd, ':'); if (!colon_after_user) goto bad_input; /* compare "user:" */ if (cur->after_colon[0] != '*' && strncmp(cur->after_colon, user_and_passwd, colon_after_user - user_and_passwd + 1) != 0 ) { continue; } /* this cfg entry is '*' or matches username from peer */ passwd = strchr(cur->after_colon, ':'); if (!passwd) goto bad_input; passwd++; if (passwd[0] == '*') { # if ENABLE_PAM struct pam_userinfo userinfo; struct pam_conv conv_info = { &pam_talker, (void *) &userinfo }; pam_handle_t *pamh; *colon_after_user = '\0'; userinfo.name = user_and_passwd; userinfo.pw = colon_after_user + 1; r = pam_start("httpd", user_and_passwd, &conv_info, &pamh) != PAM_SUCCESS; if (r == 0) { r = pam_authenticate(pamh, PAM_DISALLOW_NULL_AUTHTOK) != PAM_SUCCESS || pam_acct_mgmt(pamh, PAM_DISALLOW_NULL_AUTHTOK) != PAM_SUCCESS ; pam_end(pamh, PAM_SUCCESS); } *colon_after_user = ':'; goto end_check_passwd; # else # if ENABLE_FEATURE_SHADOWPASSWDS /* Using _r function to avoid pulling in static buffers */ struct spwd spw; # endif struct passwd *pw; *colon_after_user = '\0'; pw = getpwnam(user_and_passwd); *colon_after_user = ':'; if (!pw || !pw->pw_passwd) continue; passwd = pw->pw_passwd; # if ENABLE_FEATURE_SHADOWPASSWDS if ((passwd[0] == 'x' || passwd[0] == '*') && !passwd[1]) { /* getspnam_r may return 0 yet set result to NULL. * At least glibc 2.4 does this. Be extra paranoid here. */ struct spwd *result = NULL; r = getspnam_r(pw->pw_name, &spw, sp_buf, sizeof(sp_buf), &result); if (r == 0 && result) passwd = result->sp_pwdp; } # endif /* In this case, passwd is ALWAYS encrypted: * it came from /etc/passwd or /etc/shadow! */ goto check_encrypted; # endif /* ENABLE_PAM */ } /* Else: passwd is from httpd.conf, it is either plaintext or encrypted */ if (passwd[0] == '$' && isdigit(passwd[1])) { char *encrypted; # if !ENABLE_PAM check_encrypted: # endif /* encrypt pwd from peer and check match with local one */ encrypted = pw_encrypt( /* pwd (from peer): */ colon_after_user + 1, /* salt: */ passwd, /* cleanup: */ 0 ); r = strcmp(encrypted, passwd); free(encrypted); } else { /* local passwd is from httpd.conf and it's plaintext */ r = strcmp(colon_after_user + 1, passwd); } goto end_check_passwd; } bad_input: /* Comparing plaintext "user:pass" in one go */ r = strcmp(cur->after_colon, user_and_passwd); end_check_passwd: if (r == 0) { remoteuser = xstrndup(user_and_passwd, strchrnul(user_and_passwd, ':') - user_and_passwd ); return 1; /* Ok */ } } /* for */ /* 0(bad) if prev is set: matches were found but passwd was wrong */ return (prev == NULL); } #endif /* FEATURE_HTTPD_BASIC_AUTH */ #if ENABLE_FEATURE_HTTPD_PROXY static Htaccess_Proxy *find_proxy_entry(const char *url) { Htaccess_Proxy *p; for (p = proxy; p; p = p->next) { if (is_prefixed_with(url, p->url_from)) return p; } return NULL; } #endif /* * Handle timeouts */ static void send_REQUEST_TIMEOUT_and_exit(int sig) NORETURN; static void send_REQUEST_TIMEOUT_and_exit(int sig UNUSED_PARAM) { send_headers_and_exit(HTTP_REQUEST_TIMEOUT); } /* * Handle an incoming http request and exit. */ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) NORETURN; static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr) { static const char request_GET[] ALIGN1 = "GET"; struct stat sb; char *urlcopy; char *urlp; char *tptr; unsigned remote_ip; #if ENABLE_FEATURE_HTTPD_CGI unsigned total_headers_len; #endif #if ENABLE_FEATURE_HTTPD_CGI static const char request_HEAD[] ALIGN1 = "HEAD"; const char *prequest; unsigned long length = 0; enum CGI_type cgi_type = CGI_NONE; #elif ENABLE_FEATURE_HTTPD_PROXY #define prequest request_GET unsigned long length = 0; #endif #if ENABLE_FEATURE_HTTPD_BASIC_AUTH smallint authorized = -1; #endif char *HTTP_slash; /* Allocation of iobuf is postponed until now * (IOW, server process doesn't need to waste 8k) */ iobuf = xmalloc(IOBUF_SIZE); remote_ip = 0; if (fromAddr->u.sa.sa_family == AF_INET) { remote_ip = ntohl(fromAddr->u.sin.sin_addr.s_addr); } #if ENABLE_FEATURE_IPV6 if (fromAddr->u.sa.sa_family == AF_INET6 && fromAddr->u.sin6.sin6_addr.s6_addr32[0] == 0 && fromAddr->u.sin6.sin6_addr.s6_addr32[1] == 0 && ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[2]) == 0xffff) remote_ip = ntohl(fromAddr->u.sin6.sin6_addr.s6_addr32[3]); #endif if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) { /* NB: can be NULL (user runs httpd -i by hand?) */ rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->u.sa); } if (verbose) { /* this trick makes -v logging much simpler */ if (rmt_ip_str) applet_name = rmt_ip_str; if (verbose > 2) bb_error_msg("connected"); } if_ip_denied_send_HTTP_FORBIDDEN_and_exit(remote_ip); /* Install timeout handler. get_line() needs it. */ signal(SIGALRM, send_REQUEST_TIMEOUT_and_exit); if (!get_line()) /* EOF or error or empty line */ send_headers_and_exit(HTTP_BAD_REQUEST); /* Determine type of request (GET/POST) */ // rfc2616: method and URI is separated by exactly one space //urlp = strpbrk(iobuf, " \t"); - no, tab isn't allowed urlp = strchr(iobuf, ' '); if (urlp == NULL) send_headers_and_exit(HTTP_BAD_REQUEST); *urlp++ = '\0'; #if ENABLE_FEATURE_HTTPD_CGI prequest = request_GET; if (strcasecmp(iobuf, prequest) != 0) { prequest = request_HEAD; if (strcasecmp(iobuf, prequest) != 0) { prequest = "POST"; if (strcasecmp(iobuf, prequest) != 0) send_headers_and_exit(HTTP_NOT_IMPLEMENTED); } } #else if (strcasecmp(iobuf, request_GET) != 0) send_headers_and_exit(HTTP_NOT_IMPLEMENTED); #endif // rfc2616: method and URI is separated by exactly one space //urlp = skip_whitespace(urlp); - should not be necessary if (urlp[0] != '/') send_headers_and_exit(HTTP_BAD_REQUEST); /* Find end of URL */ HTTP_slash = strchr(urlp, ' '); /* Is it " HTTP/"? */ if (!HTTP_slash || strncmp(HTTP_slash + 1, HTTP_200, 5) != 0) send_headers_and_exit(HTTP_BAD_REQUEST); *HTTP_slash++ = '\0'; /* Copy URL from after "GET "/"POST " to stack-allocated char[] */ urlcopy = alloca((HTTP_slash - urlp) + 2 + strlen(index_page)); /*if (urlcopy == NULL) * send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR);*/ strcpy(urlcopy, urlp); /* NB: urlcopy ptr is never changed after this */ #if ENABLE_FEATURE_HTTPD_PROXY { int proxy_fd; len_and_sockaddr *lsa; Htaccess_Proxy *proxy_entry = find_proxy_entry(urlcopy); if (proxy_entry) { if (verbose > 1) bb_error_msg("proxy:%s", urlcopy); lsa = host2sockaddr(proxy_entry->host_port, 80); if (!lsa) send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR); proxy_fd = socket(lsa->u.sa.sa_family, SOCK_STREAM, 0); if (proxy_fd < 0) send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR); if (connect(proxy_fd, &lsa->u.sa, lsa->len) < 0) send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR); /* Disable peer header reading timeout */ alarm(0); /* Config directive was of the form: * P:/url:[http://]hostname[:port]/new/path * When /urlSFX is requested, reverse proxy it * to http://hostname[:port]/new/pathSFX */ fdprintf(proxy_fd, "%s %s%s %s\r\n", prequest, /* "GET" or "POST" */ proxy_entry->url_to, /* "/new/path" */ urlcopy + strlen(proxy_entry->url_from), /* "SFX" */ HTTP_slash /* "HTTP/xyz" */ ); cgi_io_loop_and_exit(proxy_fd, proxy_fd, /*max POST length:*/ INT_MAX); } } #endif /* Extract url args if present */ g_query = strchr(urlcopy, '?'); if (g_query) *g_query++ = '\0'; /* Decode URL escape sequences */ tptr = percent_decode_in_place(urlcopy, /*strict:*/ 1); if (tptr == NULL) send_headers_and_exit(HTTP_BAD_REQUEST); if (tptr == urlcopy + 1) { /* '/' or NUL is encoded */ send_headers_and_exit(HTTP_NOT_FOUND); } /* Canonicalize path */ /* Algorithm stolen from libbb bb_simplify_path(), * but don't strdup, retain trailing slash, protect root */ urlp = tptr = urlcopy; for (;;) { if (*urlp == '/') { /* skip duplicate (or initial) slash */ if (*tptr == '/') { goto next_char; } if (*tptr == '.') { if (tptr[1] == '.' && (tptr[2] == '/' || tptr[2] == '\0')) { /* "..": be careful */ /* protect root */ if (urlp == urlcopy) send_headers_and_exit(HTTP_BAD_REQUEST); /* omit previous dir */ while (*--urlp != '/') continue; /* skip to "./" or "." */ tptr++; } if (tptr[1] == '/' || tptr[1] == '\0') { /* skip extra "/./" */ goto next_char; } } } *++urlp = *tptr; if (*tptr == '\0') break; next_char: tptr++; } /* If URL is a directory, add '/' */ if (urlp[-1] != '/') { if (is_directory(urlcopy + 1, /*followlinks:*/ 1)) { found_moved_temporarily = urlcopy; } } /* Log it */ if (verbose > 1) bb_error_msg("url:%s", urlcopy); tptr = urlcopy; while ((tptr = strchr(tptr + 1, '/')) != NULL) { /* have path1/path2 */ *tptr = '\0'; if (is_directory(urlcopy + 1, /*followlinks:*/ 1)) { /* may have subdir config */ parse_conf(urlcopy + 1, SUBDIR_PARSE); if_ip_denied_send_HTTP_FORBIDDEN_and_exit(remote_ip); } *tptr = '/'; } tptr = urlcopy + 1; /* skip first '/' */ #if ENABLE_FEATURE_HTTPD_CGI if (is_prefixed_with(tptr, "cgi-bin/")) { if (tptr[8] == '\0') { /* protect listing "cgi-bin/" */ send_headers_and_exit(HTTP_FORBIDDEN); } cgi_type = CGI_NORMAL; } #endif if (urlp[-1] == '/') { /* When index_page string is appended to / URL, it overwrites * the query string. If we fall back to call /cgi-bin/index.cgi, * query string would be lost and not available to the CGI. * Work around it by making a deep copy. */ if (ENABLE_FEATURE_HTTPD_CGI) g_query = xstrdup(g_query); /* ok for NULL too */ strcpy(urlp, index_page); } if (stat(tptr, &sb) == 0) { #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR char *suffix = strrchr(tptr, '.'); if (suffix) { Htaccess *cur; for (cur = script_i; cur; cur = cur->next) { if (strcmp(cur->before_colon + 1, suffix) == 0) { cgi_type = CGI_INTERPRETER; break; } } } #endif if (!found_moved_temporarily) { file_size = sb.st_size; last_mod = sb.st_mtime; } } #if ENABLE_FEATURE_HTTPD_CGI else if (urlp[-1] == '/') { /* It's a dir URL and there is no index.html * Try cgi-bin/index.cgi */ if (access("/cgi-bin/index.cgi"+1, X_OK) == 0) { cgi_type = CGI_INDEX; } } #endif urlp[0] = '\0'; #if ENABLE_FEATURE_HTTPD_CGI total_headers_len = 0; #endif /* Read until blank line */ while (1) { unsigned iobuf_len = get_line(); if (!iobuf_len) break; /* EOF or error or empty line */ #if ENABLE_FEATURE_HTTPD_CGI /* Prevent unlimited growth of HTTP_xyz envvars */ total_headers_len += iobuf_len; if (total_headers_len >= MAX_HTTP_HEADERS_SIZE) send_headers_and_exit(HTTP_ENTITY_TOO_LARGE); #endif if (DEBUG) bb_error_msg("header: '%s'", iobuf); #if ENABLE_FEATURE_HTTPD_CGI || ENABLE_FEATURE_HTTPD_PROXY /* Try and do our best to parse more lines */ if (STRNCASECMP(iobuf, "Content-Length:") == 0) { /* extra read only for POST */ if (prequest != request_GET # if ENABLE_FEATURE_HTTPD_CGI && prequest != request_HEAD # endif ) { tptr = skip_whitespace(iobuf + sizeof("Content-Length:") - 1); if (!tptr[0]) send_headers_and_exit(HTTP_BAD_REQUEST); /* not using strtoul: it ignores leading minus! */ length = bb_strtou(tptr, NULL, 10); /* length is "ulong", but we need to pass it to int later */ if (errno || length > INT_MAX) send_headers_and_exit(HTTP_BAD_REQUEST); } continue; } #endif #if ENABLE_FEATURE_HTTPD_BASIC_AUTH if (STRNCASECMP(iobuf, "Authorization:") == 0) { /* We only allow Basic credentials. * It shows up as "Authorization: Basic :" where * ":" is base64 encoded. */ tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1); if (STRNCASECMP(tptr, "Basic") == 0) { tptr += sizeof("Basic")-1; /* decodeBase64() skips whitespace itself */ decodeBase64(tptr); authorized = check_user_passwd(urlcopy, tptr); continue; } } #endif #if ENABLE_FEATURE_HTTPD_RANGES if (STRNCASECMP(iobuf, "Range:") == 0) { /* We know only bytes=NNN-[MMM] */ char *s = skip_whitespace(iobuf + sizeof("Range:")-1); if (is_prefixed_with(s, "bytes=")) { s += sizeof("bytes=")-1; range_start = BB_STRTOOFF(s, &s, 10); if (s[0] != '-' || range_start < 0) { range_start = -1; } else if (s[1]) { range_end = BB_STRTOOFF(s+1, NULL, 10); if (errno || range_end < range_start) range_start = -1; } } continue; } #endif #if ENABLE_FEATURE_HTTPD_GZIP if (STRNCASECMP(iobuf, "Accept-Encoding:") == 0) { /* Note: we do not support "gzip;q=0" * method of _disabling_ gzip * delivery. No one uses that, though */ const char *s = strstr(iobuf, "gzip"); if (s) { // want more thorough checks? //if (s[-1] == ' ' // || s[-1] == ',' // || s[-1] == ':' //) { content_gzip = 1; //} } continue; } #endif #if ENABLE_FEATURE_HTTPD_CGI if (cgi_type != CGI_NONE) { bool ct = (STRNCASECMP(iobuf, "Content-Type:") == 0); char *cp; char *colon = strchr(iobuf, ':'); if (!colon) continue; cp = iobuf; while (cp < colon) { /* a-z => A-Z, not-alnum => _ */ char c = (*cp & ~0x20); /* toupper for A-Za-z, undef for others */ if ((unsigned)(c - 'A') <= ('Z' - 'A')) { *cp++ = c; continue; } if (!isdigit(*cp)) *cp = '_'; cp++; } /* "Content-Type:" gets no HTTP_ prefix, all others do */ cp = xasprintf(ct ? "HTTP_%.*s=%s" + 5 : "HTTP_%.*s=%s", (int)(colon - iobuf), iobuf, skip_whitespace(colon + 1) ); putenv(cp); } #endif } /* while extra header reading */ /* We are done reading headers, disable peer timeout */ alarm(0); if (strcmp(bb_basename(urlcopy), HTTPD_CONF) == 0) { /* protect listing [/path]/httpd.conf or IP deny */ send_headers_and_exit(HTTP_FORBIDDEN); } #if ENABLE_FEATURE_HTTPD_BASIC_AUTH /* Case: no "Authorization:" was seen, but page might require passwd. * Check that with dummy user:pass */ if (authorized < 0) authorized = check_user_passwd(urlcopy, (char *) ""); if (!authorized) send_headers_and_exit(HTTP_UNAUTHORIZED); #endif if (found_moved_temporarily) { send_headers_and_exit(HTTP_MOVED_TEMPORARILY); } tptr = urlcopy + 1; /* skip first '/' */ #if ENABLE_FEATURE_HTTPD_CGI if (cgi_type != CGI_NONE) { send_cgi_and_exit( (cgi_type == CGI_INDEX) ? "/cgi-bin/index.cgi" /*CGI_NORMAL or CGI_INTERPRETER*/ : urlcopy, urlcopy, prequest, length ); } #endif if (urlp[-1] == '/') { strcpy(urlp, index_page); } #if ENABLE_FEATURE_HTTPD_CGI if (prequest != request_GET && prequest != request_HEAD) { /* POST for files does not make sense */ send_headers_and_exit(HTTP_NOT_IMPLEMENTED); } send_file_and_exit(tptr, (prequest != request_HEAD ? SEND_HEADERS_AND_BODY : SEND_HEADERS) ); #else send_file_and_exit(tptr, SEND_HEADERS_AND_BODY); #endif } /* * The main http server function. * Given a socket, listen for new connections and farm out * the processing as a [v]forked process. * Never returns. */ #if BB_MMU static void mini_httpd(int server_socket) NORETURN; static void mini_httpd(int server_socket) { /* NB: it's best to not use xfuncs in this loop before fork(). * Otherwise server may die on transient errors (temporary * out-of-memory condition, etc), which is Bad(tm). * Try to do any dangerous calls after fork. */ while (1) { int n; len_and_sockaddr fromAddr; /* Wait for connections... */ fromAddr.len = LSA_SIZEOF_SA; n = accept(server_socket, &fromAddr.u.sa, &fromAddr.len); if (n < 0) continue; /* set the KEEPALIVE option to cull dead connections */ setsockopt_keepalive(n); if (fork() == 0) { /* child */ /* Do not reload config on HUP */ signal(SIGHUP, SIG_IGN); close(server_socket); xmove_fd(n, 0); xdup2(0, 1); handle_incoming_and_exit(&fromAddr); } /* parent, or fork failed */ close(n); } /* while (1) */ /* never reached */ } #else static void mini_httpd_nommu(int server_socket, int argc, char **argv) NORETURN; static void mini_httpd_nommu(int server_socket, int argc, char **argv) { char *argv_copy[argc + 2]; argv_copy[0] = argv[0]; argv_copy[1] = (char*)"-i"; memcpy(&argv_copy[2], &argv[1], argc * sizeof(argv[0])); /* NB: it's best to not use xfuncs in this loop before vfork(). * Otherwise server may die on transient errors (temporary * out-of-memory condition, etc), which is Bad(tm). * Try to do any dangerous calls after fork. */ while (1) { int n; /* Wait for connections... */ n = accept(server_socket, NULL, NULL); if (n < 0) continue; /* set the KEEPALIVE option to cull dead connections */ setsockopt_keepalive(n); if (vfork() == 0) { /* child */ /* Do not reload config on HUP */ signal(SIGHUP, SIG_IGN); close(server_socket); xmove_fd(n, 0); xdup2(0, 1); /* Run a copy of ourself in inetd mode */ re_exec(argv_copy); } argv_copy[0][0] &= 0x7f; /* parent, or vfork failed */ close(n); } /* while (1) */ /* never reached */ } #endif /* * Process a HTTP connection on stdin/out. * Never returns. */ static void mini_httpd_inetd(void) NORETURN; static void mini_httpd_inetd(void) { len_and_sockaddr fromAddr; memset(&fromAddr, 0, sizeof(fromAddr)); fromAddr.len = LSA_SIZEOF_SA; /* NB: can fail if user runs it by hand and types in http cmds */ getpeername(0, &fromAddr.u.sa, &fromAddr.len); handle_incoming_and_exit(&fromAddr); } static void sighup_handler(int sig UNUSED_PARAM) { int sv = errno; parse_conf(DEFAULT_PATH_HTTPD_CONF, SIGNALED_PARSE); errno = sv; } enum { c_opt_config_file = 0, d_opt_decode_url, h_opt_home_httpd, IF_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,) IF_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,) IF_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,) IF_FEATURE_HTTPD_SETUID( u_opt_setuid ,) p_opt_port , p_opt_inetd , p_opt_foreground, p_opt_verbose , OPT_CONFIG_FILE = 1 << c_opt_config_file, OPT_DECODE_URL = 1 << d_opt_decode_url, OPT_HOME_HTTPD = 1 << h_opt_home_httpd, OPT_ENCODE_URL = IF_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0, OPT_REALM = IF_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0, OPT_MD5 = IF_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0, OPT_SETUID = IF_FEATURE_HTTPD_SETUID( (1 << u_opt_setuid )) + 0, OPT_PORT = 1 << p_opt_port, OPT_INETD = 1 << p_opt_inetd, OPT_FOREGROUND = 1 << p_opt_foreground, OPT_VERBOSE = 1 << p_opt_verbose, }; int httpd_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int httpd_main(int argc UNUSED_PARAM, char **argv) { int server_socket = server_socket; /* for gcc */ unsigned opt; char *url_for_decode; IF_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;) IF_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;) IF_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;) IF_FEATURE_HTTPD_AUTH_MD5(const char *pass;) INIT_G(); #if ENABLE_LOCALE_SUPPORT /* Undo busybox.c: we want to speak English in http (dates etc) */ setlocale(LC_TIME, "C"); #endif home_httpd = xrealloc_getcwd_or_warn(NULL); /* We do not "absolutize" path given by -h (home) opt. * If user gives relative path in -h, * $SCRIPT_FILENAME will not be set. */ opt = getopt32(argv, "^" "c:d:h:" IF_FEATURE_HTTPD_ENCODE_URL_STR("e:") IF_FEATURE_HTTPD_BASIC_AUTH("r:") IF_FEATURE_HTTPD_AUTH_MD5("m:") IF_FEATURE_HTTPD_SETUID("u:") "p:ifv" "\0" /* -v counts, -i implies -f */ "vv:if", &opt_c_configFile, &url_for_decode, &home_httpd IF_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode) IF_FEATURE_HTTPD_BASIC_AUTH(, &g_realm) IF_FEATURE_HTTPD_AUTH_MD5(, &pass) IF_FEATURE_HTTPD_SETUID(, &s_ugid) , &bind_addr_or_port , &verbose ); if (opt & OPT_DECODE_URL) { fputs(percent_decode_in_place(url_for_decode, /*strict:*/ 0), stdout); return 0; } #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR if (opt & OPT_ENCODE_URL) { fputs(encodeString(url_for_encode), stdout); return 0; } #endif #if ENABLE_FEATURE_HTTPD_AUTH_MD5 if (opt & OPT_MD5) { char salt[sizeof("$1$XXXXXXXX")]; salt[0] = '$'; salt[1] = '1'; salt[2] = '$'; crypt_make_salt(salt + 3, 4); puts(pw_encrypt(pass, salt, /*cleanup:*/ 0)); return 0; } #endif #if ENABLE_FEATURE_HTTPD_SETUID if (opt & OPT_SETUID) { xget_uidgid(&ugid, s_ugid); } #endif #if !BB_MMU if (!(opt & OPT_FOREGROUND)) { bb_daemonize_or_rexec(0, argv); /* don't change current directory */ } #endif xchdir(home_httpd); if (!(opt & OPT_INETD)) { signal(SIGCHLD, SIG_IGN); server_socket = openServer(); #if ENABLE_FEATURE_HTTPD_SETUID /* drop privileges */ if (opt & OPT_SETUID) { if (ugid.gid != (gid_t)-1) { if (setgroups(1, &ugid.gid) == -1) bb_perror_msg_and_die("setgroups"); xsetgid(ugid.gid); } xsetuid(ugid.uid); } #endif } #if 0 /* User can do it himself: 'env - PATH="$PATH" httpd' * We don't do it because we don't want to screw users * which want to do * 'env - VAR1=val1 VAR2=val2 httpd' * and have VAR1 and VAR2 values visible in their CGIs. * Besides, it is also smaller. */ { char *p = getenv("PATH"); /* env strings themself are not freed, no need to xstrdup(p): */ clearenv(); if (p) putenv(p - 5); // if (!(opt & OPT_INETD)) // setenv_long("SERVER_PORT", ???); } #endif parse_conf(DEFAULT_PATH_HTTPD_CONF, FIRST_PARSE); if (!(opt & OPT_INETD)) signal(SIGHUP, sighup_handler); xfunc_error_retval = 0; if (opt & OPT_INETD) mini_httpd_inetd(); /* never returns */ #if BB_MMU if (!(opt & OPT_FOREGROUND)) bb_daemonize(0); /* don't change current directory */ mini_httpd(server_socket); /* never returns */ #else mini_httpd_nommu(server_socket, argc, argv); /* never returns */ #endif /* return 0; */ }