/* vi: set sw=4 ts=4: */ /* * httpd implementation for busybox * * Copyright (C) 2002,2003 Glenn Engel * Copyright (C) 2003-2006 Vladimir Oleynik * * simplify patch stolen from libbb without using strdup * * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. * ***************************************************************************** * * Typical usage: * for non root user * httpd -p 8080 -h $HOME/public_html * or for daemon start from rc script with uid=0: * httpd -u www * This is equivalent if www user have uid=80 to * httpd -p 80 -u 80 -h /www -c /etc/httpd.conf -r "Web Server Authentication" * * * When a url starts by "/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. * * Doc: * "CGI Environment Variables": http://hoohoo.ncsa.uiuc.edu/cgi/env.html * * The server can also be invoked as a 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 a url-encoded argument while -e encodes in html * for page display. * * httpd.conf has the following format: * * 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/ * .au:audio/basic # additional mime type for audio.au files * *.php:/path/php # running cgi.php scripts through an interpreter * * A/D may be as a/d or allow/deny - first char case insensitive * Deny IP rules take precedence over allow rules. * * * The Deny/Allow IP logic: * * - Default is to allow all. No addresses are denied unless * denied with a D: rule. * - Order of Deny/Allow rules is significant * - Deny rules take precedence over allow rules. * - If a deny all rule (D:*) is used it acts as a catch-all for unmatched * addresses. * - Specification of Allow all (A:*) is a no-op * * 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 a 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. * */ #include "libbb.h" #if ENABLE_FEATURE_HTTPD_USE_SENDFILE #include #endif //#define DEBUG 1 #define DEBUG 0 #define IOBUF_SIZE 8192 /* IO buffer */ /* amount of buffering in a pipe */ #ifndef PIPE_BUF # define PIPE_BUF 4096 #endif #if PIPE_BUF >= IOBUF_SIZE # error "PIPE_BUF >= IOBUF_SIZE" #endif #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"; 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; 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_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 */ HTTP_RESPONSE_SETSIZE = 0xffffffff #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, #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" }, #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; unsigned rmt_ip; /* used for IP-based allow/deny rules */ time_t last_mod; char *rmt_ip_str; /* for $REMOTE_ADDR and $REMOTE_PORT */ const char *bind_addr_or_port; const char *g_query; const char *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 */ USE_FEATURE_HTTPD_BASIC_AUTH(const char *g_realm;) USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;) USE_FEATURE_HTTPD_CGI(char *referer;) USE_FEATURE_HTTPD_CGI(char *user_agent;) 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 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES Htaccess *mime_a; /* config mime types */ #endif #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 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 ) #define rmt_ip (G.rmt_ip ) #define bind_addr_or_port (G.bind_addr_or_port) #define g_query (G.g_query ) #define configFile (G.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 referer (G.referer ) #define user_agent (G.user_agent ) #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 ) #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 { \ PTR_TO_GLOBALS = xzalloc(sizeof(G)); \ USE_FEATURE_HTTPD_BASIC_AUTH(g_realm = "Web Server Authentication";) \ bind_addr_or_port = "80"; \ file_size = -1; \ } while (0) #if !ENABLE_FEATURE_HTTPD_RANGES enum { range_start = 0, range_end = MAXINT(off_t) - 1, range_len = MAXINT(off_t), }; #endif #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1) /* Prototypes */ static void send_file_and_exit(const char *url, int headers) ATTRIBUTE_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; } #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \ || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \ || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR static ALWAYS_INLINE void free_Htaccess_list(Htaccess **pptr) { free_llist((has_next_ptr**)pptr); } #endif 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. * * The first non-white character is examined to determine if the config line * is one of the following: * .ext:mime/type # new mime type not compiled into httpd * [adAD]:from # ip address allow/deny, * for wildcard * /path:user:pass # username/password * Ennn:error.html # error page for status nnn * P:/url:[http://]hostname[:port]/new/path # reverse proxy * * 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 */ #define FIRST_PARSE 0 #define SUBDIR_PARSE 1 #define SIGNALED_PARSE 2 #define FIND_FROM_HTTPD_ROOT 3 static void parse_conf(const char *path, int flag) { FILE *f; #if ENABLE_FEATURE_HTTPD_BASIC_AUTH Htaccess *prev; #endif #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \ || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \ || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR Htaccess *cur; #endif const char *cf = configFile; char buf[160]; char *p0; char *c, *p; Htaccess_IP *pip; /* discard old rules */ free_Htaccess_IP_list(&ip_a_d); flg_deny_all = 0; #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \ || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \ || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR /* retain previous auth and mime config only for subdir parse */ if (flag != SUBDIR_PARSE) { #if ENABLE_FEATURE_HTTPD_BASIC_AUTH free_Htaccess_list(&g_auth); #endif #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES free_Htaccess_list(&mime_a); #endif #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR free_Htaccess_list(&script_i); #endif } #endif if (flag == SUBDIR_PARSE || cf == NULL) { cf = alloca(strlen(path) + sizeof(httpd_conf) + 2); sprintf((char *)cf, "%s/%s", path, httpd_conf); } while ((f = fopen(cf, "r")) == NULL) { if (flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) { /* config file not found, no changes to config */ return; } if (configFile && flag == FIRST_PARSE) /* if -c option given */ bb_simple_perror_msg_and_die(cf); flag = FIND_FROM_HTTPD_ROOT; cf = httpd_conf; } #if ENABLE_FEATURE_HTTPD_BASIC_AUTH prev = g_auth; #endif /* This could stand some work */ while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) { c = NULL; for (p = p0; *p0 != '\0' && *p0 != '#'; p0++) { if (!isspace(*p0)) { *p++ = *p0; if (*p0 == ':' && c == NULL) c = p; } } *p = '\0'; /* test for empty or strange line */ if (c == NULL || *c == '\0') continue; p0 = buf; if (*p0 == 'd') *p0 = 'D'; if (*c == '*') { if (*p0 == 'D') { /* memorize deny all */ flg_deny_all = 1; } /* skip default other "word:*" config lines */ continue; } if (*p0 == 'a') *p0 = 'A'; if (*p0 == 'A' || *p0 == 'D') { /* storing current config IP line */ pip = xzalloc(sizeof(Htaccess_IP)); if (pip) { if (scan_ip_mask(c, &(pip->ip), &(pip->mask))) { /* syntax IP{/mask} error detected, protect all */ *p0 = 'D'; pip->mask = 0; } pip->allow_deny = *p0; if (*p0 == 'D') { /* Deny:from_IP move top */ pip->next = ip_a_d; ip_a_d = pip; } else { /* add to bottom A:form_IP config line */ 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 && *p0 == 'E') { int i; /* error status code */ int status = atoi(++p0); /* c already points at the character following ':' in parse loop */ /* c = strchr(p0, ':'); c++; */ if (status < HTTP_CONTINUE) { bb_error_msg("config error '%s' in '%s'", buf, cf); continue; } /* then error page; find matching status */ for (i = 0; i < ARRAY_SIZE(http_response_type); i++) { if (http_response_type[i] == status) { http_error_page[i] = concat_path_file((*c == '/') ? NULL : home_httpd, c); break; } } continue; } #endif #if ENABLE_FEATURE_HTTPD_PROXY if (flag == FIRST_PARSE && *p0 == 'P') { /* P:/url:[http://]hostname[:port]/new/path */ char *url_from, *host_port, *url_to; Htaccess_Proxy *proxy_entry; url_from = c; host_port = strchr(c, ':'); if (host_port == NULL) { bb_error_msg("config error '%s' in '%s'", buf, cf); continue; } *host_port++ = '\0'; if (strncmp(host_port, "http://", 7) == 0) host_port += 7; if (*host_port == '\0') { bb_error_msg("config error '%s' in '%s'", buf, cf); continue; } url_to = strchr(host_port, '/'); if (url_to == NULL) { bb_error_msg("config error '%s' in '%s'", buf, cf); continue; } *url_to = '\0'; proxy_entry = xzalloc(sizeof(Htaccess_Proxy)); 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 #if ENABLE_FEATURE_HTTPD_BASIC_AUTH if (*p0 == '/') { /* make full path from httpd root / current_path / config_line_path */ cf = (flag == SUBDIR_PARSE ? path : ""); p0 = xmalloc(strlen(cf) + (c - buf) + 2 + strlen(c)); c[-1] = '\0'; sprintf(p0, "/%s%s", cf, buf); /* another call bb_simplify_path */ cf = p = p0; do { if (*p == '/') { if (*cf == '/') { /* skip duplicate (or initial) slash */ continue; } if (*cf == '.') { if (cf[1] == '/' || cf[1] == '\0') { /* remove extra '.' */ continue; } if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == '\0')) { ++cf; if (p > p0) { while (*--p != '/') /* omit previous dir */; } continue; } } } *++p = *cf; } while (*++cf); if ((p == p0) || (*p != '/')) { /* not a trailing slash */ ++p; /* so keep last character */ } *p = ':'; strcpy(p + 1, c); } #endif if (*p0 == 'I') { index_page = xstrdup(c); continue; } #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \ || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \ || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR /* storing current config line */ cur = xzalloc(sizeof(Htaccess) + strlen(p0)); cf = strcpy(cur->before_colon, p0); #if ENABLE_FEATURE_HTTPD_BASIC_AUTH if (*p0 == '/') free(p0); #endif c = strchr(cf, ':'); *c++ = '\0'; cur->after_colon = c; #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES if (*cf == '.') { /* config .mime line move top for overwrite previous */ cur->next = mime_a; mime_a = cur; continue; } #endif #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR if (*cf == '*' && cf[1] == '.') { /* config script interpreter line move top for overwrite previous */ cur->next = script_i; script_i = cur; continue; } #endif #if ENABLE_FEATURE_HTTPD_BASIC_AUTH if (prev == NULL) { /* first line */ g_auth = prev = cur; } else { /* sort path, if current length eq or bigger then move up */ Htaccess *prev_hti = g_auth; size_t l = strlen(cf); Htaccess *hti; for (hti = prev_hti; hti; hti = hti->next) { if (l >= strlen(hti->before_colon)) { /* insert before hti */ cur->next = hti; if (prev_hti != hti) { prev_hti->next = cur; } else { /* insert as top */ g_auth = cur; } break; } if (prev_hti != hti) prev_hti = prev_hti->next; } if (!hti) { /* not inserted, add to bottom */ prev->next = cur; prev = cur; } } #endif /* BASIC_AUTH */ #endif /* BASIC_AUTH || MIME_TYPES || SCRIPT_INTERPR */ } /* 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++)) { /* very simple check for what to encode */ if (isalnum(ch)) *p++ = ch; else p += sprintf(p, "&#%d;", (unsigned char) ch); } *p = '\0'; return out; } #endif /* FEATURE_HTTPD_ENCODE_URL_STR */ /* * Given a URL encoded string, convert it to plain ascii. * Since decoding always makes strings smaller, the decode is done in-place. * Thus, callers should strdup() the argument if they do not want the * argument modified. The return is the original pointer, allowing this * function to be easily used as arguments to other functions. * * string The first string to decode. * option_d 1 if called for httpd -d * * Returns a pointer to the decoded string (same as input). */ static unsigned hex_to_bin(unsigned char c) { unsigned v; v = c - '0'; if (v <= 9) return v; /* c | 0x20: letters to lower case, non-letters * to (potentially different) non-letters */ v = (unsigned)(c | 0x20) - 'a'; if (v <= 5) return v + 10; return ~0; } /* For testing: void t(char c) { printf("'%c'(%u) %u\n", c, c, hex_to_bin(c)); } int main() { t(0x10); t(0x20); t('0'); t('9'); t('A'); t('F'); t('a'); t('f'); t('0'-1); t('9'+1); t('A'-1); t('F'+1); t('a'-1); t('f'+1); return 0; } */ static char *decodeString(char *orig, int option_d) { /* note that decoded string is always shorter than original */ char *string = orig; char *ptr = string; char c; while ((c = *ptr++) != '\0') { unsigned v; if (option_d && c == '+') { *string++ = ' '; continue; } if (c != '%') { *string++ = c; continue; } v = hex_to_bin(ptr[0]); if (v > 15) { bad_hex: if (!option_d) return NULL; *string++ = '%'; continue; } v = (v * 16) | hex_to_bin(ptr[1]); if (v > 255) goto bad_hex; if (!option_d && (v == '/' || v == '\0')) { /* caller takes it as indication of invalid * (dangerous wrt exploits) chars */ return orig + 1; } *string++ = v; ptr += 2; } *string = '\0'; return orig; } #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) ATTRIBUTE_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); ndelay_on(0); while (read(0, 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(int responseNum) { static const char RFC1123FMT[] ALIGN1 = "%a, %d %b %Y %H:%M:%S GMT"; const char *responseString = ""; const char *infoString = NULL; const char *mime_type; #if ENABLE_FEATURE_HTTPD_ERROR_PAGES const char *error_page = 0; #endif unsigned i; time_t timer = time(0); char tmp_str[80]; int len; 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; } } /* error message is HTML */ mime_type = responseNum == HTTP_OK ? found_mime_type : "text/html"; if (verbose) bb_error_msg("response:%u", responseNum); /* emit the current date */ strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&timer)); len = sprintf(iobuf, "HTTP/1.0 %d %s\r\nContent-type: %s\r\n" "Date: %s\r\nConnection: close\r\n", responseNum, responseString, mime_type, tmp_str); #if ENABLE_FEATURE_HTTPD_BASIC_AUTH if (responseNum == HTTP_UNAUTHORIZED) { len += sprintf(iobuf + len, "WWW-Authenticate: Basic realm=\"%s\"\r\n", g_realm); } #endif if (responseNum == HTTP_MOVED_TEMPORARILY) { len += sprintf(iobuf + len, "Location: %s/%s%s\r\n", found_moved_temporarily, (g_query ? "?" : ""), (g_query ? g_query : "")); } #if ENABLE_FEATURE_HTTPD_ERROR_PAGES if (error_page && !access(error_page, R_OK)) { strcat(iobuf, "\r\n"); len += 2; if (DEBUG) fprintf(stderr, "headers: '%s'\n", iobuf); full_write(1, iobuf, len); if (DEBUG) fprintf(stderr, "writing error page: '%s'\n", error_page); return send_file_and_exit(error_page, FALSE); } #endif if (file_size != -1) { /* file */ strftime(tmp_str, sizeof(tmp_str), RFC1123FMT, gmtime(&last_mod)); #if ENABLE_FEATURE_HTTPD_RANGES if (responseNum == HTTP_PARTIAL_CONTENT) { len += sprintf(iobuf + len, "Content-Range: bytes %"OFF_FMT"d-%"OFF_FMT"d/%"OFF_FMT"d\r\n", range_start, range_end, file_size); file_size = range_end - range_start + 1; } #endif len += sprintf(iobuf + len, #if ENABLE_FEATURE_HTTPD_RANGES "Accept-Ranges: bytes\r\n" #endif "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n", tmp_str, "Content-length:", file_size ); } iobuf[len++] = '\r'; iobuf[len++] = '\n'; if (infoString) { len += sprintf(iobuf + len, "%d %s\n" "

%d %s

\n%s\n\n", responseNum, responseString, responseNum, responseString, infoString); } if (DEBUG) fprintf(stderr, "headers: '%s'\n", iobuf); if (full_write(1, iobuf, len) != len) { if (verbose > 1) bb_perror_msg("error"); log_and_exit(); } } static void send_headers_and_exit(int responseNum) ATTRIBUTE_NORETURN; static void send_headers_and_exit(int responseNum) { 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 int get_line(void) { int count = 0; char c; while (1) { if (hdr_cnt <= 0) { hdr_cnt = safe_read(0, hdr_buf, sizeof(hdr_buf)); if (hdr_cnt <= 0) break; hdr_ptr = hdr_buf; } iobuf[count] = c = *hdr_ptr++; hdr_cnt--; if (c == '\r') continue; if (c == '\n') { iobuf[count] = '\0'; return count; } if (count < (IOBUF_SIZE - 1)) /* check overflow */ count++; } 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) ATTRIBUTE_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; while (1) { memset(pfd, 0, sizeof(pfd)); pfd[FROM_CGI].fd = fromCgi_rd; pfd[FROM_CGI].events = POLLIN; if (toCgi_wr) { pfd[TO_CGI].fd = toCgi_wr; if (hdr_cnt > 0) { pfd[TO_CGI].events = POLLOUT; } else if (post_len > 0) { pfd[0].events = POLLIN; } else { /* post_len <= 0 && hdr_cnt <= 0: * no more POST data to CGI, * let CGI see EOF on CGI's stdin */ close(toCgi_wr); toCgi_wr = 0; } } /* Now wait on the set of sockets */ count = safe_poll(pfd, 3, -1); if (count <= 0) { #if 0 if (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=%d", WEXITSTATUS(status)); if (DEBUG && WIFSIGNALED(status)) bb_error_msg("CGI killed, signal=%d", WTERMSIG(status)); #endif break; } if (pfd[TO_CGI].revents) { /* hdr_cnt > 0 here due to the way pfd[TO_CGI].events set */ /* 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(0, hdr_buf, count); count = safe_read(0, 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, PIPE_BUF - 8); if (count <= 0) { /* eof (or error) and there was no "HTTP", * so write it, then write received data */ if (out_cnt) { full_write(1, HTTP_200, sizeof(HTTP_200)-1); full_write(1, 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(1, HTTP_200, 9) != 9) break; rbuf += 8; /* skip "Status: " */ 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(1, 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, PIPE_BUF); if (count <= 0) break; /* eof (or error) */ } if (full_write(1, 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 /). * int post_len Length of the POST body. * const char *cookie For set HTTP_COOKIE. * const char *content_type For set CONTENT_TYPE. */ static void send_cgi_and_exit( const char *url, const char *request, int post_len, const char *cookie, const char *content_type) ATTRIBUTE_NORETURN; static void send_cgi_and_exit( const char *url, const char *request, int post_len, const char *cookie, const char *content_type) { struct { int rd; int wr; } fromCgi; /* CGI -> httpd pipe */ struct { int rd; int wr; } toCgi; /* httpd -> CGI pipe */ char *fullpath; char *script; char *purl; int pid; /* * We are mucking with environment _first_ and then vfork/exec, * this allows us to use vfork safely. Parent don't care about * these environment changes anyway. */ /* * Find PATH_INFO. */ purl = xstrdup(url); script = purl; while ((script = strchr(script + 1, '/')) != NULL) { /* have script.cgi/PATH_INFO or dirs/script.cgi[/PATH_INFO] */ struct stat sb; *script = '\0'; if (!is_directory(purl + 1, 1, &sb)) { /* not directory, found script.cgi/PATH_INFO */ *script = '/'; break; } *script = '/'; /* is directory, find next '/' */ } setenv1("PATH_INFO", script); /* set /PATH_INFO or "" */ setenv1("REQUEST_METHOD", request); if (g_query) { putenv(xasprintf("%s=%s?%s", "REQUEST_URI", purl, g_query)); } else { setenv1("REQUEST_URI", purl); } if (script != NULL) *script = '\0'; /* cut off /PATH_INFO */ /* SCRIPT_FILENAME required by PHP in CGI mode */ fullpath = concat_path_file(home_httpd, purl); setenv1("SCRIPT_FILENAME", fullpath); /* set SCRIPT_NAME as full path: /cgi-bin/dirs/script.cgi */ setenv1("SCRIPT_NAME", purl); /* 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 } } setenv1("HTTP_USER_AGENT", user_agent); if (post_len) putenv(xasprintf("CONTENT_LENGTH=%d", post_len)); if (cookie) setenv1("HTTP_COOKIE", cookie); if (content_type) setenv1("CONTENT_TYPE", content_type); #if ENABLE_FEATURE_HTTPD_BASIC_AUTH if (remoteuser) { setenv1("REMOTE_USER", remoteuser); putenv((char*)"AUTH_TYPE=Basic"); } #endif if (referer) setenv1("HTTP_REFERER", referer); xpipe(&fromCgi.rd); xpipe(&toCgi.rd); pid = vfork(); if (pid < 0) { /* TODO: log perror? */ log_and_exit(); } if (!pid) { /* Child process */ xfunc_error_retval = 242; xmove_fd(toCgi.rd, 0); /* replace stdin with the pipe */ xmove_fd(fromCgi.wr, 1); /* replace stdout with the pipe */ close(fromCgi.rd); close(toCgi.wr); /* User seeing stderr output can be a security problem. * If CGI really wants that, it can always do dup itself. */ /* dup2(1, 2); */ /* script must have absolute path */ script = strrchr(fullpath, '/'); if (!script) goto error_execing_cgi; *script = '\0'; /* chdiring to script's dir */ if (chdir(fullpath) == 0) { char *argv[2]; #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR char *interpr = NULL; char *suffix = strrchr(purl, '.'); if (suffix) { Htaccess *cur; for (cur = script_i; cur; cur = cur->next) { if (strcmp(cur->before_colon + 1, suffix) == 0) { interpr = cur->after_colon; break; } } } #endif *script = '/'; /* set argv[0] to name without path */ argv[0] = (char*)bb_basename(purl); argv[1] = NULL; #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR if (interpr) execv(interpr, argv); else #endif execv(fullpath, argv); } 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 /). * headers Don't send headers before if FALSE. */ static void send_file_and_exit(const char *url, int headers) { static const char *const suffixTable[] = { /* Warning: shorter equivalent suffix in one line must be first */ ".htm.html", "text/html", ".jpg.jpeg", "image/jpeg", ".gif", "image/gif", ".png", "image/png", ".txt.h.c.cc.cpp", "text/plain", ".css", "text/css", ".wav", "audio/wav", ".avi", "video/x-msvideo", ".qt.mov", "video/quicktime", ".mpe.mpeg", "video/mpeg", ".mid.midi", "audio/midi", ".mp3", "audio/mpeg", #if 0 /* unpopular */ ".au", "audio/basic", ".pac", "application/x-ns-proxy-autoconfig", ".vrml.wrl", "model/vrml", #endif NULL }; char *suffix; int f; const char *const *table; const char *try_suffix; ssize_t count; #if ENABLE_FEATURE_HTTPD_USE_SENDFILE off_t offset; #endif suffix = strrchr(url, '.'); /* If not found, set default as "application/octet-stream"; */ found_mime_type = "application/octet-stream"; if (suffix) { #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES Htaccess *cur; #endif for (table = suffixTable; *table; table += 2) { try_suffix = strstr(table[0], suffix); if (try_suffix) { try_suffix += strlen(suffix); if (*try_suffix == '\0' || *try_suffix == '.') { found_mime_type = table[1]; break; } } } #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES for (cur = mime_a; cur; cur = cur->next) { if (strcmp(cur->before_colon, suffix) == 0) { found_mime_type = cur->after_colon; break; } } #endif } if (DEBUG) bb_error_msg("sending file '%s' content-type: %s", url, found_mime_type); f = open(url, O_RDONLY); if (f < 0) { if (DEBUG) bb_perror_msg("cannot open '%s'", url); if (headers) send_headers_and_exit(HTTP_NOT_FOUND); } #if ENABLE_FEATURE_HTTPD_RANGES if (!headers) range_start = 0; /* err pages and ranges don't mix */ range_len = MAXINT(off_t); if (range_start) { if (!range_end) { range_end = file_size - 1; } if (range_end < range_start || lseek(f, range_start, SEEK_SET) != range_start ) { lseek(f, 0, SEEK_SET); range_start = 0; } else { range_len = range_end - range_start + 1; send_headers(HTTP_PARTIAL_CONTENT); headers = 0; } } #endif if (headers) send_headers(HTTP_OK); /* If you want to know about EPIPE below * (happens if you abort downloads from local httpd): */ signal(SIGPIPE, SIG_IGN); #if ENABLE_FEATURE_HTTPD_USE_SENDFILE offset = range_start; do { /* sz is rounded down to 64k */ ssize_t sz = MAXINT(ssize_t) - 0xffff; USE_FEATURE_HTTPD_RANGES(if (sz > range_len) sz = range_len;) count = sendfile(1, f, &offset, sz); if (count < 0) { if (offset == range_start) goto fallback; goto fin; } USE_FEATURE_HTTPD_RANGES(range_len -= sz;) } while (count > 0 && range_len); log_and_exit(); fallback: #endif while ((count = safe_read(f, iobuf, IOBUF_SIZE)) > 0) { ssize_t n; USE_FEATURE_HTTPD_RANGES(if (count > range_len) count = range_len;) n = full_write(1, iobuf, count); if (count != n) break; USE_FEATURE_HTTPD_RANGES(range_len -= count;) if (!range_len) break; } #if ENABLE_FEATURE_HTTPD_USE_SENDFILE fin: #endif if (count < 0 && verbose > 1) bb_perror_msg("error"); log_and_exit(); } static int checkPermIP(void) { Htaccess_IP *cur; /* This could stand some work */ 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 ((rmt_ip & cur->mask) == cur->ip) return cur->allow_deny == 'A'; /* Allow/Deny */ } /* if unconfigured, return 1 - access from all */ return !flg_deny_all; } #if ENABLE_FEATURE_HTTPD_BASIC_AUTH /* * Check the permission file for access password protected. * * If config file isn't present, everything is allowed. * Entries are of the form you can see example from header source * * path The file path. * request User information to validate. * * Returns 1 if request is OK. */ static int checkPerm(const char *path, const char *request) { Htaccess *cur; const char *p; const char *p0; const char *prev = NULL; /* This could stand some work */ for (cur = g_auth; cur; cur = cur->next) { size_t l; p0 = cur->before_colon; if (prev != NULL && strcmp(prev, p0) != 0) continue; /* find next identical */ p = cur->after_colon; if (DEBUG) fprintf(stderr, "checkPerm: '%s' ? '%s'\n", p0, request); l = strlen(p0); if (strncmp(p0, path, l) == 0 && (l == 1 || path[l] == '/' || path[l] == '\0') ) { char *u; /* path match found. Check request */ /* for check next /path:user:password */ prev = p0; u = strchr(request, ':'); if (u == NULL) { /* bad request, ':' required */ break; } if (ENABLE_FEATURE_HTTPD_AUTH_MD5) { char *cipher; char *pp; if (strncmp(p, request, u - request) != 0) { /* user doesn't match */ continue; } pp = strchr(p, ':'); if (pp && pp[1] == '$' && pp[2] == '1' && pp[3] == '$' && pp[4] ) { pp++; cipher = pw_encrypt(u+1, pp); if (strcmp(cipher, pp) == 0) goto set_remoteuser_var; /* Ok */ /* unauthorized */ continue; } } if (strcmp(p, request) == 0) { set_remoteuser_var: remoteuser = strdup(request); if (remoteuser) remoteuser[u - request] = '\0'; return 1; /* Ok */ } /* unauthorized */ } } /* for */ 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 (strncmp(url, p->url_from, strlen(p->url_from)) == 0) return p; } return NULL; } #endif /* * Handle timeouts */ static void exit_on_signal(int sig) ATTRIBUTE_NORETURN; static void exit_on_signal(int sig) { 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) ATTRIBUTE_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; int ip_allowed; #if ENABLE_FEATURE_HTTPD_CGI const char *prequest; char *cookie = NULL; char *content_type = NULL; unsigned long length = 0; #elif ENABLE_FEATURE_HTTPD_PROXY #define prequest request_GET unsigned long length = 0; #endif char http_major_version; #if ENABLE_FEATURE_HTTPD_PROXY char http_minor_version; char *header_buf = header_buf; /* for gcc */ char *header_ptr = header_ptr; Htaccess_Proxy *proxy_entry; #endif struct sigaction sa; #if ENABLE_FEATURE_HTTPD_BASIC_AUTH int credentials = -1; /* if not required this is Ok */ #endif /* Allocation of iobuf is postponed until now * (IOW, server process doesn't need to waste 8k) */ iobuf = xmalloc(IOBUF_SIZE); rmt_ip = 0; if (fromAddr->sa.sa_family == AF_INET) { rmt_ip = ntohl(fromAddr->sin.sin_addr.s_addr); } #if ENABLE_FEATURE_IPV6 if (fromAddr->sa.sa_family == AF_INET6 && fromAddr->sin6.sin6_addr.s6_addr32[0] == 0 && fromAddr->sin6.sin6_addr.s6_addr32[1] == 0 && ntohl(fromAddr->sin6.sin6_addr.s6_addr32[2]) == 0xffff) rmt_ip = ntohl(fromAddr->sin6.sin6_addr.s6_addr32[3]); #endif if (ENABLE_FEATURE_HTTPD_CGI || DEBUG || verbose) { rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr->sa); } if (verbose) { /* this trick makes -v logging much simpler */ applet_name = rmt_ip_str; if (verbose > 2) bb_error_msg("connected"); } /* Install timeout handler */ memset(&sa, 0, sizeof(sa)); sa.sa_handler = exit_on_signal; /* sigemptyset(&sa.sa_mask); - memset should be enough */ /*sa.sa_flags = 0; - no SA_RESTART */ sigaction(SIGALRM, &sa, NULL); alarm(HEADER_READ_TIMEOUT); if (!get_line()) /* EOF or error or empty line */ send_headers_and_exit(HTTP_BAD_REQUEST); /* Determine type of request (GET/POST) */ urlp = strpbrk(iobuf, " \t"); 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 = "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 urlp = skip_whitespace(urlp); if (urlp[0] != '/') send_headers_and_exit(HTTP_BAD_REQUEST); /* Find end of URL and parse HTTP version, if any */ http_major_version = '0'; USE_FEATURE_HTTPD_PROXY(http_minor_version = '0';) tptr = strchrnul(urlp, ' '); /* Is it " HTTP/"? */ if (tptr[0] && strncmp(tptr + 1, HTTP_200, 5) == 0) { http_major_version = tptr[6]; USE_FEATURE_HTTPD_PROXY(http_minor_version = tptr[8];) } *tptr = '\0'; /* Copy URL from after "GET "/"POST " to stack-allocated char[] */ urlcopy = alloca((tptr - 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 */ /* Extract url args if present */ g_query = NULL; tptr = strchr(urlcopy, '?'); if (tptr) { *tptr++ = '\0'; g_query = tptr; } /* Decode URL escape sequences */ tptr = decodeString(urlcopy, 0); 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 and reducing trailing slash and protect out root */ urlp = tptr = urlcopy; do { if (*urlp == '/') { /* skip duplicate (or initial) slash */ if (*tptr == '/') { continue; } if (*tptr == '.') { /* skip extra '.' */ if (tptr[1] == '/' || !tptr[1]) { continue; } /* '..': be careful */ if (tptr[1] == '.' && (tptr[2] == '/' || !tptr[2])) { ++tptr; if (urlp == urlcopy) /* protect root */ send_headers_and_exit(HTTP_BAD_REQUEST); while (*--urlp != '/') /* omit previous dir */; continue; } } } *++urlp = *tptr; } while (*++tptr); *++urlp = '\0'; /* so keep last character */ tptr = urlp; /* end ptr */ /* If URL is a directory, add '/' */ if (tptr[-1] != '/') { if (is_directory(urlcopy + 1, 1, &sb)) { found_moved_temporarily = urlcopy; } } /* Log it */ if (verbose > 1) bb_error_msg("url:%s", urlcopy); tptr = urlcopy; ip_allowed = checkPermIP(); while (ip_allowed && (tptr = strchr(tptr + 1, '/')) != NULL) { /* have path1/path2 */ *tptr = '\0'; if (is_directory(urlcopy + 1, 1, &sb)) { /* may be having subdir config */ parse_conf(urlcopy + 1, SUBDIR_PARSE); ip_allowed = checkPermIP(); } *tptr = '/'; } #if ENABLE_FEATURE_HTTPD_PROXY proxy_entry = find_proxy_entry(urlcopy); if (proxy_entry) header_buf = header_ptr = xmalloc(IOBUF_SIZE); #endif if (http_major_version >= '0') { /* Request was with "... HTTP/nXXX", and n >= 0 */ /* Read until blank line for HTTP version specified, else parse immediate */ while (1) { alarm(HEADER_READ_TIMEOUT); if (!get_line()) break; /* EOF or error or empty line */ if (DEBUG) bb_error_msg("header: '%s'", iobuf); #if ENABLE_FEATURE_HTTPD_PROXY /* We need 2 more bytes for yet another "\r\n" - * see near fdprintf(proxy_fd...) further below */ if (proxy_entry && (header_ptr - header_buf) < IOBUF_SIZE - 2) { int len = strlen(iobuf); if (len > IOBUF_SIZE - (header_ptr - header_buf) - 4) len = IOBUF_SIZE - (header_ptr - header_buf) - 4; memcpy(header_ptr, iobuf, len); header_ptr += len; header_ptr[0] = '\r'; header_ptr[1] = '\n'; header_ptr += 2; } #endif #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) { tptr = iobuf + sizeof("Content-length:") - 1; if (!tptr[0]) send_headers_and_exit(HTTP_BAD_REQUEST); errno = 0; /* not using strtoul: it ignores leading minus! */ length = strtol(tptr, &tptr, 10); /* length is "ulong", but we need to pass it to int later */ /* so we check for negative or too large values in one go: */ /* (long -> ulong conv caused negatives to be seen as > INT_MAX) */ if (tptr[0] || errno || length > INT_MAX) send_headers_and_exit(HTTP_BAD_REQUEST); } } #endif #if ENABLE_FEATURE_HTTPD_CGI else if (STRNCASECMP(iobuf, "Cookie:") == 0) { cookie = strdup(skip_whitespace(iobuf + sizeof("Cookie:")-1)); } else if (STRNCASECMP(iobuf, "Content-Type:") == 0) { content_type = strdup(skip_whitespace(iobuf + sizeof("Content-Type:")-1)); } else if (STRNCASECMP(iobuf, "Referer:") == 0) { referer = strdup(skip_whitespace(iobuf + sizeof("Referer:")-1)); } else if (STRNCASECMP(iobuf, "User-Agent:") == 0) { user_agent = strdup(skip_whitespace(iobuf + sizeof("User-Agent:")-1)); } #endif #if ENABLE_FEATURE_HTTPD_BASIC_AUTH if (STRNCASECMP(iobuf, "Authorization:") == 0) { /* We only allow Basic credentials. * It shows up as "Authorization: Basic " where * the userid:password is base64 encoded. */ tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1); if (STRNCASECMP(tptr, "Basic") != 0) continue; tptr += sizeof("Basic")-1; /* decodeBase64() skips whitespace itself */ decodeBase64(tptr); credentials = checkPerm(urlcopy, tptr); } #endif /* FEATURE_HTTPD_BASIC_AUTH */ #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 (strncmp(s, "bytes=", 6) == 0) { s += sizeof("bytes=")-1; range_start = BB_STRTOOFF(s, &s, 10); if (s[0] != '-' || range_start < 0) { range_start = 0; } else if (s[1]) { range_end = BB_STRTOOFF(s+1, NULL, 10); if (errno || range_end < range_start) range_start = 0; } } } #endif } /* while extra header reading */ } /* We are done reading headers, disable peer timeout */ alarm(0); if (strcmp(bb_basename(urlcopy), httpd_conf) == 0 || ip_allowed == 0) { /* protect listing [/path]/httpd_conf or IP deny */ send_headers_and_exit(HTTP_FORBIDDEN); } #if ENABLE_FEATURE_HTTPD_BASIC_AUTH if (credentials <= 0 && checkPerm(urlcopy, ":") == 0) { send_headers_and_exit(HTTP_UNAUTHORIZED); } #endif if (found_moved_temporarily) { send_headers_and_exit(HTTP_MOVED_TEMPORARILY); } #if ENABLE_FEATURE_HTTPD_PROXY if (proxy_entry != NULL) { int proxy_fd; len_and_sockaddr *lsa; proxy_fd = socket(AF_INET, SOCK_STREAM, 0); if (proxy_fd < 0) send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR); lsa = host2sockaddr(proxy_entry->host_port, 80); if (lsa == NULL) send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR); if (connect(proxy_fd, &lsa->sa, lsa->len) < 0) send_headers_and_exit(HTTP_INTERNAL_SERVER_ERROR); fdprintf(proxy_fd, "%s %s%s%s%s HTTP/%c.%c\r\n", prequest, /* GET or POST */ proxy_entry->url_to, /* url part 1 */ urlcopy + strlen(proxy_entry->url_from), /* url part 2 */ (g_query ? "?" : ""), /* "?" (maybe) */ (g_query ? g_query : ""), /* query string (maybe) */ http_major_version, http_minor_version); header_ptr[0] = '\r'; header_ptr[1] = '\n'; header_ptr += 2; write(proxy_fd, header_buf, header_ptr - header_buf); free(header_buf); /* on the order of 8k, free it */ /* cgi_io_loop_and_exit needs to have two disctinct fds */ cgi_io_loop_and_exit(proxy_fd, dup(proxy_fd), length); } #endif tptr = urlcopy + 1; /* skip first '/' */ #if ENABLE_FEATURE_HTTPD_CGI if (strncmp(tptr, "cgi-bin/", 8) == 0) { if (tptr[8] == '\0') { /* protect listing "cgi-bin/" */ send_headers_and_exit(HTTP_FORBIDDEN); } send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type); } #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) { send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type); } } } } #endif if (prequest != request_GET) { send_headers_and_exit(HTTP_NOT_IMPLEMENTED); } #endif /* FEATURE_HTTPD_CGI */ if (urlp[-1] == '/') strcpy(urlp, index_page); if (stat(tptr, &sb) == 0) { 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) { urlp[0] = '\0'; g_query = urlcopy; send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type); } } #endif /* else { * fall through to send_file, it errors out if open fails * } */ send_file_and_exit(tptr, TRUE); } /* * 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) ATTRIBUTE_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.sa, &fromAddr.len); if (n < 0) continue; /* set the KEEPALIVE option to cull dead connections */ setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1)); if (fork() == 0) { /* child */ #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP /* Do not reload config on HUP */ signal(SIGHUP, SIG_IGN); #endif 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) ATTRIBUTE_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; len_and_sockaddr fromAddr; /* Wait for connections... */ fromAddr.len = LSA_SIZEOF_SA; n = accept(server_socket, &fromAddr.sa, &fromAddr.len); if (n < 0) continue; /* set the KEEPALIVE option to cull dead connections */ setsockopt(n, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1)); if (vfork() == 0) { /* child */ #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP /* Do not reload config on HUP */ signal(SIGHUP, SIG_IGN); #endif close(server_socket); xmove_fd(n, 0); xdup2(0, 1); /* Run a copy of ourself in inetd mode */ re_exec(argv_copy); } /* 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) ATTRIBUTE_NORETURN; static void mini_httpd_inetd(void) { len_and_sockaddr fromAddr; fromAddr.len = LSA_SIZEOF_SA; getpeername(0, &fromAddr.sa, &fromAddr.len); handle_incoming_and_exit(&fromAddr); } #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP static void sighup_handler(int sig) { struct sigaction sa; parse_conf(default_path_httpd_conf, sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE); memset(&sa, 0, sizeof(sa)); sa.sa_handler = sighup_handler; /*sigemptyset(&sa.sa_mask); - memset should be enough */ sa.sa_flags = SA_RESTART; sigaction(SIGHUP, &sa, NULL); } #endif enum { c_opt_config_file = 0, d_opt_decode_url, h_opt_home_httpd, USE_FEATURE_HTTPD_ENCODE_URL_STR(e_opt_encode_url,) USE_FEATURE_HTTPD_BASIC_AUTH( r_opt_realm ,) USE_FEATURE_HTTPD_AUTH_MD5( m_opt_md5 ,) USE_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 = USE_FEATURE_HTTPD_ENCODE_URL_STR((1 << e_opt_encode_url)) + 0, OPT_REALM = USE_FEATURE_HTTPD_BASIC_AUTH( (1 << r_opt_realm )) + 0, OPT_MD5 = USE_FEATURE_HTTPD_AUTH_MD5( (1 << m_opt_md5 )) + 0, OPT_SETUID = USE_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, char **argv) { int server_socket = server_socket; /* for gcc */ unsigned opt; char *url_for_decode; USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;) USE_FEATURE_HTTPD_SETUID(const char *s_ugid = NULL;) USE_FEATURE_HTTPD_SETUID(struct bb_uidgid_t ugid;) USE_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); /* -v counts, -i implies -f */ opt_complementary = "vv:if"; /* We do not "absolutize" path given by -h (home) opt. * If user gives relative path in -h, $SCRIPT_FILENAME can end up * relative too. */ opt = getopt32(argv, "c:d:h:" USE_FEATURE_HTTPD_ENCODE_URL_STR("e:") USE_FEATURE_HTTPD_BASIC_AUTH("r:") USE_FEATURE_HTTPD_AUTH_MD5("m:") USE_FEATURE_HTTPD_SETUID("u:") "p:ifv", &configFile, &url_for_decode, &home_httpd USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode) USE_FEATURE_HTTPD_BASIC_AUTH(, &g_realm) USE_FEATURE_HTTPD_AUTH_MD5(, &pass) USE_FEATURE_HTTPD_SETUID(, &s_ugid) , &bind_addr_or_port , &verbose ); if (opt & OPT_DECODE_URL) { fputs(decodeString(url_for_decode, 1), 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) { puts(pw_encrypt(pass, "$1$")); return 0; } #endif #if ENABLE_FEATURE_HTTPD_SETUID if (opt & OPT_SETUID) { if (!get_uidgid(&ugid, s_ugid, 1)) bb_error_msg_and_die("unrecognized user[:group] " "name '%s'", 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 /*was #if ENABLE_FEATURE_HTTPD_CGI*/ /* 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 strdup(p): */ clearenv(); if (p) putenv(p - 5); // if (!(opt & OPT_INETD)) // setenv_long("SERVER_PORT", ???); } #endif #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP if (!(opt & OPT_INETD)) sighup_handler(0); else /* do not install HUP handler in inetd mode */ #endif index_page = "index.html"; parse_conf(default_path_httpd_conf, FIRST_PARSE); xfunc_error_retval = 0; if (opt & OPT_INETD) mini_httpd_inetd(); #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; */ }