| /* vi: set sw=4 ts=4: */ |
| /* |
| * httpd implementation for busybox |
| * |
| * Copyright (C) 2002,2003 Glenn Engel <glenne@engel.org> |
| * Copyright (C) 2003-2006 Vladimir Oleynik <dzo@simtreas.ru> |
| * |
| * 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 contains "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 "<Hello World>"` # 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 |
| * /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. |
| * |
| * |
| * 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 "busybox.h" |
| |
| /* amount of buffering in a pipe */ |
| #ifndef PIPE_BUF |
| # define PIPE_BUF 4096 |
| #endif |
| |
| static const char httpdVersion[] = "busybox httpd/1.35 6-Oct-2004"; |
| static const char default_path_httpd_conf[] = "/etc"; |
| static const char httpd_conf[] = "httpd.conf"; |
| static const char home[] = "./"; |
| |
| #define TIMEOUT 60 |
| |
| // Note: busybox xfuncs are not used because we want the server to keep running |
| // if something bad happens due to a malformed user request. |
| // As a result, all memory allocation after daemonize |
| // is checked rigorously |
| |
| //#define DEBUG 1 |
| #define DEBUG 0 |
| |
| #define MAX_MEMORY_BUFF 8192 /* IO buffer */ |
| |
| typedef struct HT_ACCESS { |
| char *after_colon; |
| struct HT_ACCESS *next; |
| char before_colon[1]; /* really bigger, must last */ |
| } Htaccess; |
| |
| typedef struct HT_ACCESS_IP { |
| unsigned int ip; |
| unsigned int mask; |
| int allow_deny; |
| struct HT_ACCESS_IP *next; |
| } Htaccess_IP; |
| |
| typedef struct { |
| char buf[MAX_MEMORY_BUFF]; |
| |
| USE_FEATURE_HTTPD_BASIC_AUTH(const char *realm;) |
| USE_FEATURE_HTTPD_BASIC_AUTH(char *remoteuser;) |
| |
| const char *query; |
| |
| USE_FEATURE_HTTPD_CGI(char *referer;) |
| |
| const char *configFile; |
| |
| unsigned int rmt_ip; |
| #if ENABLE_FEATURE_HTTPD_CGI || DEBUG |
| char *rmt_ip_str; /* for set env REMOTE_ADDR */ |
| #endif |
| unsigned port; /* server initial port and for |
| set env REMOTE_PORT */ |
| const char *found_mime_type; |
| const char *found_moved_temporarily; |
| |
| off_t ContentLength; /* -1 - unknown */ |
| time_t last_mod; |
| |
| Htaccess_IP *ip_a_d; /* config allow/deny lines */ |
| int flg_deny_all; |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| Htaccess *auth; /* config user:password lines */ |
| #endif |
| #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES |
| Htaccess *mime_a; /* config mime types */ |
| #endif |
| |
| int server_socket; |
| int accepted_socket; |
| volatile int alarm_signaled; |
| |
| #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR |
| Htaccess *script_i; /* config script interpreters */ |
| #endif |
| } HttpdConfig; |
| |
| static HttpdConfig *config; |
| |
| static const char request_GET[] = "GET"; /* size algorithmic optimize */ |
| |
| static const char* const suffixTable [] = { |
| /* Warning: shorted 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 |
| 0, "application/octet-stream" /* default */ |
| }; |
| |
| typedef enum { |
| HTTP_OK = 200, |
| 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, |
| #if 0 /* future use */ |
| HTTP_CONTINUE = 100, |
| 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 |
| } HttpResponseNum; |
| |
| typedef struct { |
| HttpResponseNum type; |
| const char *name; |
| const char *info; |
| } HttpEnumString; |
| |
| static const HttpEnumString httpResponseNames[] = { |
| { HTTP_OK, "OK", NULL }, |
| { HTTP_MOVED_TEMPORARILY, "Found", "Directories must end with a slash." }, |
| { HTTP_REQUEST_TIMEOUT, "Request Timeout", |
| "No request appeared within a reasonable time period." }, |
| { HTTP_NOT_IMPLEMENTED, "Not Implemented", |
| "The requested method is not recognized by this server." }, |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| { HTTP_UNAUTHORIZED, "Unauthorized", "" }, |
| #endif |
| { HTTP_NOT_FOUND, "Not Found", |
| "The requested URL was not found on this server." }, |
| { HTTP_BAD_REQUEST, "Bad Request", "Unsupported method." }, |
| { HTTP_FORBIDDEN, "Forbidden", "" }, |
| { HTTP_INTERNAL_SERVER_ERROR, "Internal Server Error", |
| "Internal Server Error" }, |
| #if 0 /* not implemented */ |
| { HTTP_CREATED, "Created" }, |
| { HTTP_ACCEPTED, "Accepted" }, |
| { HTTP_NO_CONTENT, "No Content" }, |
| { HTTP_MULTIPLE_CHOICES, "Multiple Choices" }, |
| { HTTP_MOVED_PERMANENTLY, "Moved Permanently" }, |
| { HTTP_NOT_MODIFIED, "Not Modified" }, |
| { HTTP_BAD_GATEWAY, "Bad Gateway", "" }, |
| { HTTP_SERVICE_UNAVAILABLE, "Service Unavailable", "" }, |
| #endif |
| }; |
| |
| |
| static const char RFC1123FMT[] = "%a, %d %b %Y %H:%M:%S GMT"; |
| |
| |
| #define STRNCASECMP(a, str) strncasecmp((a), (str), sizeof(str)-1) |
| |
| |
| static int scan_ip(const char **ep, unsigned int *ip, unsigned char endc) |
| { |
| const char *p = *ep; |
| int auto_mask = 8; |
| int j; |
| |
| *ip = 0; |
| for (j = 0; j < 4; j++) { |
| unsigned int octet; |
| |
| if ((*p < '0' || *p > '9') && (*p != '/' || j == 0) && *p != 0) |
| 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 != 0) |
| auto_mask += 8; |
| *ip = ((*ip) << 8) | octet; |
| } |
| if (*p != 0) { |
| if (*p != endc) |
| return -auto_mask; |
| p++; |
| if (*p == 0) |
| return -auto_mask; |
| } |
| *ep = p; |
| return auto_mask; |
| } |
| |
| static int scan_ip_mask(const char *ipm, unsigned int *ip, unsigned int *mask) |
| { |
| int i; |
| unsigned int msk; |
| |
| i = scan_ip(&ipm, ip, '/'); |
| if (i < 0) |
| return i; |
| if (*ipm) { |
| const char *p = ipm; |
| |
| i = 0; |
| while (*p) { |
| if (*p < '0' || *p > '9') { |
| if (*p == '.') { |
| i = scan_ip(&ipm, mask, 0); |
| return i != 32; |
| } |
| return -1; |
| } |
| i *= 10; |
| i += *p - '0'; |
| p++; |
| } |
| } |
| if (i > 32 || i < 0) |
| return -1; |
| msk = 0x80000000; |
| *mask = 0; |
| while (i > 0) { |
| *mask |= msk; |
| msk >>= 1; |
| i--; |
| } |
| return 0; |
| } |
| |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH \ |
| || ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES \ |
| || ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR |
| static void free_config_lines(Htaccess **pprev) |
| { |
| Htaccess *prev = *pprev; |
| |
| while (prev) { |
| Htaccess *cur = prev; |
| |
| prev = cur->next; |
| free(cur); |
| } |
| *pprev = NULL; |
| } |
| #endif |
| |
| /* flag */ |
| #define FIRST_PARSE 0 |
| #define SUBDIR_PARSE 1 |
| #define SIGNALED_PARSE 2 |
| #define FIND_FROM_HTTPD_ROOT 3 |
| /**************************************************************************** |
| * |
| > $Function: parse_conf() |
| * |
| * $Description: 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 |
| * |
| * 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. |
| * |
| * $Parameters: |
| * (const char *) path . . null for ip address checks, path for password |
| * checks. |
| * (int) flag . . . . . . the source of the parse request. |
| * |
| * $Return: (None) |
| * |
| ****************************************************************************/ |
| 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 = config->configFile; |
| char buf[160]; |
| char *p0 = NULL; |
| char *c, *p; |
| |
| /* free previous ip setup if present */ |
| Htaccess_IP *pip = config->ip_a_d; |
| |
| while (pip) { |
| Htaccess_IP *cur_ipl = pip; |
| |
| pip = cur_ipl->next; |
| free(cur_ipl); |
| } |
| config->ip_a_d = NULL; |
| |
| config->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_config_lines(&config->auth); |
| #endif |
| #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES |
| free_config_lines(&config->mime_a); |
| #endif |
| #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR |
| free_config_lines(&config->script_i); |
| #endif |
| } |
| #endif |
| |
| if (flag == SUBDIR_PARSE || cf == NULL) { |
| cf = alloca(strlen(path) + sizeof(httpd_conf) + 2); |
| if (cf == NULL) { |
| if (flag == FIRST_PARSE) |
| bb_error_msg_and_die(bb_msg_memory_exhausted); |
| return; |
| } |
| 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 (config->configFile && flag == FIRST_PARSE) /* if -c option given */ |
| bb_perror_msg_and_die("%s", cf); |
| flag = FIND_FROM_HTTPD_ROOT; |
| cf = httpd_conf; |
| } |
| |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| prev = config->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 */ |
| config->flg_deny_all++; |
| } |
| /* skip default other "word:*" config lines */ |
| continue; |
| } |
| |
| if (*p0 == 'a') |
| *p0 = 'A'; |
| else if (*p0 != 'D' && *p0 != 'A' |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| && *p0 != '/' |
| #endif |
| #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES |
| && *p0 != '.' |
| #endif |
| #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR |
| && *p0 != '*' |
| #endif |
| ) |
| continue; |
| 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:form_IP move top */ |
| pip->next = config->ip_a_d; |
| config->ip_a_d = pip; |
| } else { |
| /* add to bottom A:form_IP config line */ |
| Htaccess_IP *prev_IP = config->ip_a_d; |
| |
| if (prev_IP == NULL) { |
| config->ip_a_d = pip; |
| } else { |
| while (prev_IP->next) |
| prev_IP = prev_IP->next; |
| prev_IP->next = pip; |
| } |
| } |
| } |
| continue; |
| } |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| if (*p0 == '/') { |
| /* make full path from httpd root / curent_path / config_line_path */ |
| cf = flag == SUBDIR_PARSE ? path : ""; |
| p0 = malloc(strlen(cf) + (c - buf) + 2 + strlen(c)); |
| if (p0 == NULL) |
| continue; |
| 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; |
| } else if (*cf == '.') { |
| if (cf[1] == '/' || cf[1] == 0) { /* remove extra '.' */ |
| continue; |
| } else 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 = 0; |
| sprintf(p0, "%s:%s", p0, c); |
| } |
| #endif |
| |
| #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)); |
| if (cur) { |
| cf = strcpy(cur->before_colon, p0); |
| 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 = config->mime_a; |
| config->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 = config->script_i; |
| config->script_i = cur; |
| continue; |
| } |
| #endif |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| free(p0); |
| if (prev == NULL) { |
| /* first line */ |
| config->auth = prev = cur; |
| } else { |
| /* sort path, if current lenght eq or bigger then move up */ |
| Htaccess *prev_hti = config->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 */ |
| config->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 |
| } |
| #endif |
| } |
| fclose(f); |
| } |
| |
| #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR |
| /**************************************************************************** |
| * |
| > $Function: encodeString() |
| * |
| * $Description: 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(). |
| * |
| * $Parameters: |
| * (const char *) string . . The first string to encode. |
| * |
| * $Return: (char *) . . . .. . . A pointer to the encoded string. |
| * |
| * $Errors: Returns a null string ("") if memory is not available. |
| * |
| ****************************************************************************/ |
| 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 */ |
| |
| /**************************************************************************** |
| * |
| > $Function: decodeString() |
| * |
| * $Description: 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. |
| * |
| * $Parameters: |
| * (char *) string . . . The first string to decode. |
| * (int) option_d . . 1 if called for httpd -d |
| * |
| * $Return: (char *) . . . . A pointer to the decoded string (same as input). |
| * |
| * $Errors: None |
| * |
| ****************************************************************************/ |
| 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 value1, value2; |
| |
| if (option_d && c == '+') { |
| *string++ = ' '; |
| continue; |
| } |
| if (c != '%') { |
| *string++ = c; |
| continue; |
| } |
| if (sscanf(ptr, "%1X", &value1) != 1 |
| || sscanf(ptr+1, "%1X", &value2) != 1 |
| ) { |
| if (!option_d) |
| return NULL; |
| *string++ = '%'; |
| continue; |
| } |
| value1 = value1 * 16 + value2; |
| if (!option_d && (value1 == '/' || value1 == '\0')) { |
| /* caller takes it as indication of invalid |
| * (dangerous wrt exploits) chars */ |
| return orig + 1; |
| } |
| *string++ = value1; |
| ptr += 2; |
| } |
| *string = '\0'; |
| return orig; |
| } |
| |
| |
| #if ENABLE_FEATURE_HTTPD_CGI |
| /**************************************************************************** |
| * setenv helpers |
| ****************************************************************************/ |
| static void setenv1(const char *name, const char *value) |
| { |
| if (!value) |
| value = ""; |
| setenv(name, value, 1); |
| } |
| static void setenv_long(const char *name, long value) |
| { |
| char buf[sizeof(value)*3 + 1]; |
| sprintf(buf, "%ld", value); |
| setenv(name, buf, 1); |
| } |
| #endif |
| |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| /**************************************************************************** |
| * |
| > $Function: decodeBase64() |
| * |
| > $Description: Decode a base 64 data stream as per rfc1521. |
| * Note that the rfc states that none 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: |
| * (char *) Data . . . . A pointer to a base64 encoded string. |
| * Where to place the decoded data. |
| * |
| * $Return: void |
| * |
| * $Errors: None |
| * |
| ****************************************************************************/ |
| 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 long 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 |
| |
| |
| /**************************************************************************** |
| * |
| > $Function: openServer() |
| * |
| * $Description: create a listen server socket on the designated port. |
| * |
| * $Return: (int) . . . A connection socket. -1 for errors. |
| * |
| * $Errors: None |
| * |
| ****************************************************************************/ |
| static int openServer(void) |
| { |
| int fd; |
| |
| /* create the socket right now */ |
| fd = create_and_bind_stream_or_die(NULL, config->port); |
| xlisten(fd, 9); |
| return fd; |
| } |
| |
| /**************************************************************************** |
| * |
| > $Function: sendHeaders() |
| * |
| * $Description: 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. |
| * |
| * $Parameter: |
| * (HttpResponseNum) responseNum . . . The result code to send. |
| * |
| * $Return: (int) . . . . writing errors |
| * |
| ****************************************************************************/ |
| static int sendHeaders(HttpResponseNum responseNum) |
| { |
| char *buf = config->buf; |
| const char *responseString = ""; |
| const char *infoString = 0; |
| const char *mime_type; |
| unsigned i; |
| time_t timer = time(0); |
| char timeStr[80]; |
| int len; |
| enum { |
| numNames = sizeof(httpResponseNames) / sizeof(httpResponseNames[0]) |
| }; |
| |
| for (i = 0; i < numNames; i++) { |
| if (httpResponseNames[i].type == responseNum) { |
| responseString = httpResponseNames[i].name; |
| infoString = httpResponseNames[i].info; |
| break; |
| } |
| } |
| /* error message is HTML */ |
| mime_type = responseNum == HTTP_OK ? |
| config->found_mime_type : "text/html"; |
| |
| /* emit the current date */ |
| strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&timer)); |
| len = sprintf(buf, |
| "HTTP/1.0 %d %s\r\nContent-type: %s\r\n" |
| "Date: %s\r\nConnection: close\r\n", |
| responseNum, responseString, mime_type, timeStr); |
| |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| if (responseNum == HTTP_UNAUTHORIZED) { |
| len += sprintf(buf+len, "WWW-Authenticate: Basic realm=\"%s\"\r\n", |
| config->realm); |
| } |
| #endif |
| if (responseNum == HTTP_MOVED_TEMPORARILY) { |
| len += sprintf(buf+len, "Location: %s/%s%s\r\n", |
| config->found_moved_temporarily, |
| (config->query ? "?" : ""), |
| (config->query ? config->query : "")); |
| } |
| |
| if (config->ContentLength != -1) { /* file */ |
| strftime(timeStr, sizeof(timeStr), RFC1123FMT, gmtime(&config->last_mod)); |
| len += sprintf(buf+len, "Last-Modified: %s\r\n%s %"OFF_FMT"d\r\n", |
| timeStr, "Content-length:", config->ContentLength); |
| } |
| strcat(buf, "\r\n"); |
| len += 2; |
| if (infoString) { |
| len += sprintf(buf+len, |
| "<HEAD><TITLE>%d %s</TITLE></HEAD>\n" |
| "<BODY><H1>%d %s</H1>\n%s\n</BODY>\n", |
| responseNum, responseString, |
| responseNum, responseString, infoString); |
| } |
| if (DEBUG) |
| fprintf(stderr, "headers: '%s'\n", buf); |
| i = config->accepted_socket; |
| if (i == 0) i++; /* write to fd# 1 in inetd mode */ |
| return full_write(i, buf, len); |
| } |
| |
| /**************************************************************************** |
| * |
| > $Function: getLine() |
| * |
| * $Description: Read from the socket until an end of line char found. |
| * |
| * Characters are read one at a time until an eol sequence is found. |
| * |
| * $Return: (int) . . . . number of characters read. -1 if error. |
| * |
| ****************************************************************************/ |
| static int getLine(void) |
| { |
| int count = 0; |
| char *buf = config->buf; |
| |
| while (read(config->accepted_socket, buf + count, 1) == 1) { |
| if (buf[count] == '\r') continue; |
| if (buf[count] == '\n') { |
| buf[count] = 0; |
| return count; |
| } |
| if (count < (MAX_MEMORY_BUFF-1)) /* check overflow */ |
| count++; |
| } |
| if (count) return count; |
| else return -1; |
| } |
| |
| #if ENABLE_FEATURE_HTTPD_CGI |
| /**************************************************************************** |
| * |
| > $Function: sendCgi() |
| * |
| * $Description: Execute a CGI script and send it's stdout back |
| * |
| * 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 bodyLen) . . . . . . . . Length of the post body. |
| * (const char *cookie) . . . . . For set HTTP_COOKIE. |
| * (const char *content_type) . . For set CONTENT_TYPE. |
| * |
| * $Return: (char *) . . . . A pointer to the decoded string (same as input). |
| * |
| * $Errors: None |
| * |
| ****************************************************************************/ |
| static int sendCgi(const char *url, |
| const char *request, int bodyLen, const char *cookie, |
| const char *content_type) |
| { |
| int fromCgi[2]; /* pipe for reading data from CGI */ |
| int toCgi[2]; /* pipe for sending data to CGI */ |
| |
| static char * argp[] = { 0, 0 }; |
| int pid = 0; |
| int inFd; |
| int outFd; |
| int buf_count; |
| int status; |
| size_t post_read_size, post_read_idx; |
| |
| if (pipe(fromCgi) != 0) |
| return 0; |
| if (pipe(toCgi) != 0) |
| return 0; |
| |
| pid = fork(); |
| if (pid < 0) |
| return 0; |
| |
| if (!pid) { |
| /* child process */ |
| char *script; |
| char *purl; |
| char realpath_buff[MAXPATHLEN]; |
| |
| if (config->accepted_socket > 1) |
| close(config->accepted_socket); |
| if (config->server_socket > 1) |
| close(config->server_socket); |
| |
| dup2(toCgi[0], 0); // replace stdin with the pipe |
| dup2(fromCgi[1], 1); // replace stdout with the pipe |
| /* Huh? User seeing stderr can be a security problem... |
| * and if CGI really wants that, it can always dup2(1,2)... |
| if (!DEBUG) |
| dup2(fromCgi[1], 2); // replace stderr with the pipe |
| */ |
| /* I think we cannot inadvertently close 0, 1 here... */ |
| close(toCgi[0]); |
| close(toCgi[1]); |
| close(fromCgi[0]); |
| close(fromCgi[1]); |
| |
| /* |
| * Find PATH_INFO. |
| */ |
| xfunc_error_retval = 242; |
| 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) == 0) { |
| /* not directory, found script.cgi/PATH_INFO */ |
| *script = '/'; |
| break; |
| } |
| *script = '/'; /* is directory, find next '/' */ |
| } |
| setenv1("PATH_INFO", script); /* set /PATH_INFO or "" */ |
| /* setenv1("PATH", getenv("PATH")); redundant */ |
| setenv1("REQUEST_METHOD", request); |
| if (config->query) { |
| char *uri = alloca(strlen(purl) + 2 + strlen(config->query)); |
| if (uri) |
| sprintf(uri, "%s?%s", purl, config->query); |
| setenv1("REQUEST_URI", uri); |
| } else { |
| setenv1("REQUEST_URI", purl); |
| } |
| if (script != NULL) |
| *script = '\0'; /* cut off /PATH_INFO */ |
| /* SCRIPT_FILENAME required by PHP in CGI mode */ |
| if (!realpath(purl + 1, realpath_buff)) |
| goto error_execing_cgi; |
| setenv1("SCRIPT_FILENAME", realpath_buff); |
| /* 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", config->query); |
| setenv1("SERVER_SOFTWARE", httpdVersion); |
| 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 = config->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 ENABLE_FEATURE_HTTPD_SET_REMOTE_PORT_TO_ENV |
| setenv_long("REMOTE_PORT", config->port); |
| #endif |
| if (bodyLen) |
| setenv_long("CONTENT_LENGTH", bodyLen); |
| if (cookie) |
| setenv1("HTTP_COOKIE", cookie); |
| if (content_type) |
| setenv1("CONTENT_TYPE", content_type); |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| if (config->remoteuser) { |
| setenv1("REMOTE_USER", config->remoteuser); |
| putenv((char*)"AUTH_TYPE=Basic"); |
| } |
| #endif |
| if (config->referer) |
| setenv1("HTTP_REFERER", config->referer); |
| |
| /* set execve argp[0] without path */ |
| argp[0] = strrchr(purl, '/') + 1; |
| /* but script argp[0] must have absolute path and chdiring to this */ |
| script = strrchr(realpath_buff, '/'); |
| if (!script) |
| goto error_execing_cgi; |
| *script = '\0'; |
| if (chdir(realpath_buff) == 0) { |
| // Now run the program. If it fails, |
| // use _exit() so no destructors |
| // get called and make a mess. |
| #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR |
| char *interpr = NULL; |
| char *suffix = strrchr(purl, '.'); |
| |
| if (suffix) { |
| Htaccess *cur; |
| for (cur = config->script_i; cur; cur = cur->next) { |
| if (strcmp(cur->before_colon + 1, suffix) == 0) { |
| interpr = cur->after_colon; |
| break; |
| } |
| } |
| } |
| #endif |
| *script = '/'; |
| #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR |
| if (interpr) |
| execv(interpr, argp); |
| else |
| #endif |
| execv(realpath_buff, argp); |
| } |
| error_execing_cgi: |
| /* send to stdout (even if we are not from inetd) */ |
| config->accepted_socket = 1; |
| sendHeaders(HTTP_NOT_FOUND); |
| _exit(242); |
| } /* end child */ |
| |
| /* parent process */ |
| |
| buf_count = 0; |
| post_read_size = 0; |
| post_read_idx = 0; /* for gcc */ |
| inFd = fromCgi[0]; |
| outFd = toCgi[1]; |
| close(fromCgi[1]); |
| close(toCgi[0]); |
| signal(SIGPIPE, SIG_IGN); |
| |
| while (1) { |
| fd_set readSet; |
| fd_set writeSet; |
| char wbuf[128]; |
| int nfound; |
| int count; |
| |
| FD_ZERO(&readSet); |
| FD_ZERO(&writeSet); |
| FD_SET(inFd, &readSet); |
| if (bodyLen > 0 || post_read_size > 0) { |
| FD_SET(outFd, &writeSet); |
| nfound = outFd > inFd ? outFd : inFd; |
| if (post_read_size == 0) { |
| FD_SET(config->accepted_socket, &readSet); |
| if (nfound < config->accepted_socket) |
| nfound = config->accepted_socket; |
| } |
| /* Now wait on the set of sockets! */ |
| nfound = select(nfound + 1, &readSet, &writeSet, NULL, NULL); |
| } else { |
| if (!bodyLen) { |
| close(outFd); /* no more POST data to CGI */ |
| bodyLen = -1; |
| } |
| nfound = select(inFd + 1, &readSet, NULL, NULL, NULL); |
| } |
| |
| if (nfound <= 0) { |
| if (waitpid(pid, &status, WNOHANG) <= 0) { |
| /* Weird. CGI didn't exit and no fd's |
| * are ready, yet select returned?! */ |
| continue; |
| } |
| close(inFd); |
| if (DEBUG && WIFEXITED(status)) |
| bb_error_msg("piped has exited with status=%d", WEXITSTATUS(status)); |
| if (DEBUG && WIFSIGNALED(status)) |
| bb_error_msg("piped has exited with signal=%d", WTERMSIG(status)); |
| break; |
| } |
| |
| if (post_read_size > 0 && FD_ISSET(outFd, &writeSet)) { |
| /* Have data from peer and can write to CGI */ |
| // huh? why full_write? what if we will block? |
| // (imagine that CGI does not read its stdin...) |
| count = full_write(outFd, wbuf + post_read_idx, post_read_size); |
| if (count > 0) { |
| post_read_idx += count; |
| post_read_size -= count; |
| } else { |
| post_read_size = bodyLen = 0; /* broken pipe to CGI */ |
| } |
| } else if (bodyLen > 0 && post_read_size == 0 |
| && FD_ISSET(config->accepted_socket, &readSet) |
| ) { |
| /* We expect data, prev data portion is eaten by CGI |
| * and there *is* data to read from the peer |
| * (POSTDATA?) */ |
| count = bodyLen > (int)sizeof(wbuf) ? (int)sizeof(wbuf) : bodyLen; |
| count = safe_read(config->accepted_socket, wbuf, count); |
| if (count > 0) { |
| post_read_size = count; |
| post_read_idx = 0; |
| bodyLen -= count; |
| } else { |
| bodyLen = 0; /* closed */ |
| } |
| } |
| |
| #define PIPESIZE PIPE_BUF |
| #if PIPESIZE >= MAX_MEMORY_BUFF |
| # error "PIPESIZE >= MAX_MEMORY_BUFF" |
| #endif |
| if (FD_ISSET(inFd, &readSet)) { |
| /* There is something to read from CGI */ |
| int s = config->accepted_socket; |
| char *rbuf = config->buf; |
| |
| /* Are we still buffering CGI output? */ |
| if (buf_count >= 0) { |
| static const char HTTP_200[] = "HTTP/1.0 200 OK\r\n\r\n"; |
| /* 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(inFd, rbuf + buf_count, PIPESIZE - 4); |
| if (count <= 0) { |
| /* eof (or error) and there was no "HTTP", |
| * so add one and write out the received data */ |
| if (buf_count) { |
| full_write(s, HTTP_200, sizeof(HTTP_200)-1); |
| full_write(s, rbuf, buf_count); |
| } |
| break; /* closed */ |
| } |
| buf_count += count; |
| count = 0; |
| if (buf_count >= 4) { |
| /* check to see if CGI added "HTTP" */ |
| if (memcmp(rbuf, HTTP_200, 4) != 0) { |
| /* there is no "HTTP", do it ourself */ |
| if (full_write(s, HTTP_200, sizeof(HTTP_200)-1) != sizeof(HTTP_200)-1) |
| break; |
| } |
| /* 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" |
| if (!strstr(rbuf, "ontent-")) { |
| full_write(s, "Content-type: text/plain\r\n\r\n", 28); |
| } |
| */ |
| count = buf_count; |
| buf_count = -1; /* buffering off */ |
| } |
| } else { |
| count = safe_read(inFd, rbuf, PIPESIZE); |
| if (count <= 0) |
| break; /* eof (or error) */ |
| } |
| if (full_write(s, rbuf, count) != count) |
| break; |
| if (DEBUG) |
| fprintf(stderr, "cgi read %d bytes: '%.*s'\n", count, count, rbuf); |
| } /* if (FD_ISSET(inFd)) */ |
| } /* while (1) */ |
| return 0; |
| } |
| #endif /* FEATURE_HTTPD_CGI */ |
| |
| /**************************************************************************** |
| * |
| > $Function: sendFile() |
| * |
| * $Description: Send a file response to a HTTP request |
| * |
| * $Parameter: |
| * (const char *) url . . The URL requested. |
| * |
| * $Return: (int) . . . . . . Always 0. |
| * |
| ****************************************************************************/ |
| static int sendFile(const char *url) |
| { |
| char * suffix; |
| int f; |
| const char * const * table; |
| const char * try_suffix; |
| |
| suffix = strrchr(url, '.'); |
| |
| for (table = suffixTable; *table; table += 2) |
| if (suffix != NULL && (try_suffix = strstr(*table, suffix)) != 0) { |
| try_suffix += strlen(suffix); |
| if (*try_suffix == 0 || *try_suffix == '.') |
| break; |
| } |
| /* also, if not found, set default as "application/octet-stream"; */ |
| config->found_mime_type = table[1]; |
| #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES |
| if (suffix) { |
| Htaccess * cur; |
| |
| for (cur = config->mime_a; cur; cur = cur->next) { |
| if (strcmp(cur->before_colon, suffix) == 0) { |
| config->found_mime_type = cur->after_colon; |
| break; |
| } |
| } |
| } |
| #endif /* FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES */ |
| |
| if (DEBUG) |
| fprintf(stderr, "sending file '%s' content-type: %s\n", |
| url, config->found_mime_type); |
| |
| f = open(url, O_RDONLY); |
| if (f >= 0) { |
| int count; |
| char *buf = config->buf; |
| |
| sendHeaders(HTTP_OK); |
| /* TODO: sendfile() */ |
| while ((count = full_read(f, buf, MAX_MEMORY_BUFF)) > 0) { |
| int fd = config->accepted_socket; |
| if (fd == 0) fd++; /* write to fd# 1 in inetd mode */ |
| if (full_write(fd, buf, count) != count) |
| break; |
| } |
| close(f); |
| } else { |
| if (DEBUG) |
| bb_perror_msg("cannot open '%s'", url); |
| sendHeaders(HTTP_NOT_FOUND); |
| } |
| |
| return 0; |
| } |
| |
| static int checkPermIP(void) |
| { |
| Htaccess_IP * cur; |
| |
| /* This could stand some work */ |
| for (cur = config->ip_a_d; cur; cur = cur->next) { |
| #if ENABLE_FEATURE_HTTPD_CGI && DEBUG |
| fprintf(stderr, "checkPermIP: '%s' ? ", config->rmt_ip_str); |
| #endif |
| #if DEBUG |
| fprintf(stderr, "'%u.%u.%u.%u/%u.%u.%u.%u'\n", |
| (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 ((config->rmt_ip & cur->mask) == cur->ip) |
| return cur->allow_deny == 'A'; /* Allow/Deny */ |
| } |
| |
| /* if unconfigured, return 1 - access from all */ |
| return !config->flg_deny_all; |
| } |
| |
| /**************************************************************************** |
| * |
| > $Function: checkPerm() |
| * |
| * $Description: 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 |
| * |
| * $Parameters: |
| * (const char *) path . . . . The file path. |
| * (const char *) request . . . User information to validate. |
| * |
| * $Return: (int) . . . . . . . . . 1 if request OK, 0 otherwise. |
| * |
| ****************************************************************************/ |
| |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| static int checkPerm(const char *path, const char *request) |
| { |
| Htaccess * cur; |
| const char *p; |
| const char *p0; |
| |
| const char *prev = NULL; |
| |
| /* This could stand some work */ |
| for (cur = config->auth; cur; cur = cur->next) { |
| size_t l; |
| |
| p0 = cur->before_colon; |
| if (prev != NULL && strcmp(prev, p0) != 0) |
| continue; /* find next identical */ |
| p = cur->after_colon; |
| if (DEBUG) |
| fprintf(stderr, "checkPerm: '%s' ? '%s'\n", p0, request); |
| |
| l = strlen(p0); |
| if (strncmp(p0, path, l) == 0 |
| && (l == 1 || path[l] == '/' || path[l] == '\0') |
| ) { |
| char *u; |
| /* path match found. Check request */ |
| /* for check next /path:user:password */ |
| prev = p0; |
| u = strchr(request, ':'); |
| if (u == NULL) { |
| /* bad request, ':' required */ |
| break; |
| } |
| |
| if (ENABLE_FEATURE_HTTPD_AUTH_MD5) { |
| char *cipher; |
| char *pp; |
| |
| if (strncmp(p, request, u-request) != 0) { |
| /* user uncompared */ |
| continue; |
| } |
| pp = strchr(p, ':'); |
| if (pp && pp[1] == '$' && 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: |
| config->remoteuser = strdup(request); |
| if (config->remoteuser) |
| config->remoteuser[(u - request)] = 0; |
| return 1; /* Ok */ |
| } |
| /* unauthorized */ |
| } |
| } /* for */ |
| |
| return prev == NULL; |
| } |
| |
| #endif /* FEATURE_HTTPD_BASIC_AUTH */ |
| |
| /**************************************************************************** |
| * |
| > $Function: handle_sigalrm() |
| * |
| * $Description: Handle timeouts |
| * |
| ****************************************************************************/ |
| |
| static void handle_sigalrm(int sig) |
| { |
| sendHeaders(HTTP_REQUEST_TIMEOUT); |
| config->alarm_signaled = sig; |
| } |
| |
| /**************************************************************************** |
| * |
| > $Function: handleIncoming() |
| * |
| * $Description: Handle an incoming http request. |
| * |
| ****************************************************************************/ |
| static void handleIncoming(void) |
| { |
| char *buf = config->buf; |
| char *url; |
| char *purl; |
| int blank = -1; |
| char *test; |
| struct stat sb; |
| int ip_allowed; |
| #if ENABLE_FEATURE_HTTPD_CGI |
| const char *prequest = request_GET; |
| unsigned long length = 0; |
| char *cookie = 0; |
| char *content_type = 0; |
| #endif |
| fd_set s_fd; |
| struct timeval tv; |
| int retval; |
| struct sigaction sa; |
| |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| int credentials = -1; /* if not required this is Ok */ |
| #endif |
| |
| sa.sa_handler = handle_sigalrm; |
| sigemptyset(&sa.sa_mask); |
| sa.sa_flags = 0; /* no SA_RESTART */ |
| sigaction(SIGALRM, &sa, NULL); |
| |
| do { |
| int count; |
| |
| (void) alarm(TIMEOUT); |
| if (getLine() <= 0) |
| break; /* closed */ |
| |
| purl = strpbrk(buf, " \t"); |
| if (purl == NULL) { |
| BAD_REQUEST: |
| sendHeaders(HTTP_BAD_REQUEST); |
| break; |
| } |
| *purl = '\0'; |
| #if ENABLE_FEATURE_HTTPD_CGI |
| if (strcasecmp(buf, prequest) != 0) { |
| prequest = "POST"; |
| if (strcasecmp(buf, prequest) != 0) { |
| sendHeaders(HTTP_NOT_IMPLEMENTED); |
| break; |
| } |
| } |
| #else |
| if (strcasecmp(buf, request_GET) != 0) { |
| sendHeaders(HTTP_NOT_IMPLEMENTED); |
| break; |
| } |
| #endif |
| *purl = ' '; |
| count = sscanf(purl, " %[^ ] HTTP/%d.%*d", buf, &blank); |
| |
| if (count < 1 || buf[0] != '/') { |
| /* Garbled request/URL */ |
| goto BAD_REQUEST; |
| } |
| url = alloca(strlen(buf) + sizeof("/index.html")); |
| if (url == NULL) { |
| sendHeaders(HTTP_INTERNAL_SERVER_ERROR); |
| break; |
| } |
| strcpy(url, buf); |
| /* extract url args if present */ |
| test = strchr(url, '?'); |
| config->query = NULL; |
| if (test) { |
| *test++ = '\0'; |
| config->query = test; |
| } |
| |
| test = decodeString(url, 0); |
| if (test == NULL) |
| goto BAD_REQUEST; |
| if (test == url+1) { |
| /* '/' or NUL is encoded */ |
| sendHeaders(HTTP_NOT_FOUND); |
| break; |
| } |
| |
| /* algorithm stolen from libbb bb_simplify_path(), |
| but don't strdup and reducing trailing slash and protect out root */ |
| purl = test = url; |
| do { |
| if (*purl == '/') { |
| /* skip duplicate (or initial) slash */ |
| if (*test == '/') { |
| continue; |
| } |
| if (*test == '.') { |
| /* skip extra '.' */ |
| if (test[1] == '/' || test[1] == 0) { |
| continue; |
| } else |
| /* '..': be careful */ |
| if (test[1] == '.' && (test[2] == '/' || test[2] == 0)) { |
| ++test; |
| if (purl == url) { |
| /* protect out root */ |
| goto BAD_REQUEST; |
| } |
| while (*--purl != '/') /* omit previous dir */; |
| continue; |
| } |
| } |
| } |
| *++purl = *test; |
| } while (*++test); |
| *++purl = '\0'; /* so keep last character */ |
| test = purl; /* end ptr */ |
| |
| /* If URL is directory, adding '/' */ |
| if (test[-1] != '/') { |
| if (is_directory(url + 1, 1, &sb)) { |
| config->found_moved_temporarily = url; |
| } |
| } |
| if (DEBUG) |
| fprintf(stderr, "url='%s', args=%s\n", url, config->query); |
| |
| test = url; |
| ip_allowed = checkPermIP(); |
| while (ip_allowed && (test = strchr(test + 1, '/')) != NULL) { |
| /* have path1/path2 */ |
| *test = '\0'; |
| if (is_directory(url + 1, 1, &sb)) { |
| /* may be having subdir config */ |
| parse_conf(url + 1, SUBDIR_PARSE); |
| ip_allowed = checkPermIP(); |
| } |
| *test = '/'; |
| } |
| if (blank >= 0) { |
| /* read until blank line for HTTP version specified, else parse immediate */ |
| while (1) { |
| alarm(TIMEOUT); |
| count = getLine(); |
| if (count <= 0) |
| break; |
| |
| if (DEBUG) |
| fprintf(stderr, "header: '%s'\n", buf); |
| |
| #if ENABLE_FEATURE_HTTPD_CGI |
| /* try and do our best to parse more lines */ |
| if ((STRNCASECMP(buf, "Content-length:") == 0)) { |
| /* extra read only for POST */ |
| if (prequest != request_GET) { |
| test = buf + sizeof("Content-length:")-1; |
| if (!test[0]) |
| goto bail_out; |
| errno = 0; |
| /* not using strtoul: it ignores leading munis! */ |
| length = strtol(test, &test, 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 (test[0] || errno || length > INT_MAX) |
| goto bail_out; |
| } |
| } else if ((STRNCASECMP(buf, "Cookie:") == 0)) { |
| cookie = strdup(skip_whitespace(buf + sizeof("Cookie:")-1)); |
| } else if ((STRNCASECMP(buf, "Content-Type:") == 0)) { |
| content_type = strdup(skip_whitespace(buf + sizeof("Content-Type:")-1)); |
| } else if ((STRNCASECMP(buf, "Referer:") == 0)) { |
| config->referer = strdup(skip_whitespace(buf + sizeof("Referer:")-1)); |
| } |
| #endif |
| |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| if (STRNCASECMP(buf, "Authorization:") == 0) { |
| /* We only allow Basic credentials. |
| * It shows up as "Authorization: Basic <userid:password>" where |
| * the userid:password is base64 encoded. |
| */ |
| test = skip_whitespace(buf + sizeof("Authorization:")-1); |
| if (STRNCASECMP(test, "Basic") != 0) |
| continue; |
| test += sizeof("Basic")-1; |
| /* decodeBase64() skips whitespace itself */ |
| decodeBase64(test); |
| credentials = checkPerm(url, test); |
| } |
| #endif /* FEATURE_HTTPD_BASIC_AUTH */ |
| |
| } /* while extra header reading */ |
| } |
| alarm(0); |
| if (config->alarm_signaled) |
| break; |
| |
| if (strcmp(strrchr(url, '/') + 1, httpd_conf) == 0 || ip_allowed == 0) { |
| /* protect listing [/path]/httpd_conf or IP deny */ |
| #if ENABLE_FEATURE_HTTPD_CGI |
| FORBIDDEN: /* protect listing /cgi-bin */ |
| #endif |
| sendHeaders(HTTP_FORBIDDEN); |
| break; |
| } |
| |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| if (credentials <= 0 && checkPerm(url, ":") == 0) { |
| sendHeaders(HTTP_UNAUTHORIZED); |
| break; |
| } |
| #endif |
| |
| if (config->found_moved_temporarily) { |
| sendHeaders(HTTP_MOVED_TEMPORARILY); |
| /* clear unforked memory flag */ |
| config->found_moved_temporarily = NULL; |
| break; |
| } |
| |
| test = url + 1; /* skip first '/' */ |
| |
| #if ENABLE_FEATURE_HTTPD_CGI |
| if (strncmp(test, "cgi-bin", 7) == 0) { |
| if (test[7] == '/' && test[8] == 0) |
| goto FORBIDDEN; /* protect listing cgi-bin/ */ |
| sendCgi(url, prequest, length, cookie, content_type); |
| break; |
| } |
| if (prequest != request_GET) { |
| sendHeaders(HTTP_NOT_IMPLEMENTED); |
| break; |
| } |
| #endif /* FEATURE_HTTPD_CGI */ |
| if (purl[-1] == '/') |
| strcpy(purl, "index.html"); |
| if (stat(test, &sb) == 0) { |
| /* It's a dir URL and there is index.html */ |
| config->ContentLength = sb.st_size; |
| config->last_mod = sb.st_mtime; |
| } |
| #if ENABLE_FEATURE_HTTPD_CGI |
| else if (purl[-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) { |
| purl[0] = '\0'; |
| config->query = url; |
| sendCgi("/cgi-bin/index.cgi", prequest, length, cookie, content_type); |
| break; |
| } |
| } |
| #endif /* FEATURE_HTTPD_CGI */ |
| sendFile(test); |
| config->ContentLength = -1; |
| } while (0); |
| |
| #if ENABLE_FEATURE_HTTPD_CGI |
| bail_out: |
| #endif |
| |
| if (DEBUG) |
| fprintf(stderr, "closing socket\n\n"); |
| #if ENABLE_FEATURE_HTTPD_CGI |
| free(cookie); |
| free(content_type); |
| free(config->referer); |
| config->referer = NULL; |
| # if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| free(config->remoteuser); |
| config->remoteuser = NULL; |
| # endif |
| #endif |
| shutdown(config->accepted_socket, SHUT_WR); |
| |
| /* Properly wait for remote to closed */ |
| FD_ZERO(&s_fd); |
| FD_SET(config->accepted_socket, &s_fd); |
| |
| do { |
| tv.tv_sec = 2; |
| tv.tv_usec = 0; |
| retval = select(config->accepted_socket + 1, &s_fd, NULL, NULL, &tv); |
| } while (retval > 0 && read(config->accepted_socket, buf, sizeof(config->buf) > 0)); |
| |
| shutdown(config->accepted_socket, SHUT_RD); |
| /* In inetd case, we close fd 1 (stdout) here. We will exit soon anyway */ |
| close(config->accepted_socket); |
| } |
| |
| /**************************************************************************** |
| * |
| > $Function: miniHttpd() |
| * |
| * $Description: The main http server function. |
| * |
| * Given an open socket fildes, listen for new connections and farm out |
| * the processing as a forked process. |
| * |
| * $Parameters: |
| * (int) server. . . The server socket fildes. |
| * |
| * $Return: (int) . . . . Always 0. |
| * |
| ****************************************************************************/ |
| static int miniHttpd(int server) |
| { |
| fd_set readfd, portfd; |
| |
| FD_ZERO(&portfd); |
| FD_SET(server, &portfd); |
| |
| /* copy the ports we are watching to the readfd set */ |
| while (1) { |
| int s; |
| union { |
| struct sockaddr sa; |
| struct sockaddr_in sin; |
| USE_FEATURE_IPV6(struct sockaddr_in6 sin6;) |
| } fromAddr; |
| socklen_t fromAddrLen = sizeof(fromAddr); |
| |
| /* Now wait INDEFINITELY on the set of sockets! */ |
| readfd = portfd; |
| if (select(server + 1, &readfd, 0, 0, 0) <= 0) |
| continue; |
| if (!FD_ISSET(server, &readfd)) |
| continue; |
| s = accept(server, &fromAddr.sa, &fromAddrLen); |
| if (s < 0) |
| continue; |
| config->accepted_socket = s; |
| config->rmt_ip = 0; |
| config->port = 0; |
| #if ENABLE_FEATURE_HTTPD_CGI || DEBUG |
| free(config->rmt_ip_str); |
| config->rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr.sa, fromAddrLen); |
| #if DEBUG |
| bb_error_msg("connection from '%s'", config->rmt_ip_str); |
| #endif |
| #endif /* FEATURE_HTTPD_CGI */ |
| if (fromAddr.sa.sa_family == AF_INET) { |
| config->rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr); |
| config->port = ntohs(fromAddr.sin.sin_port); |
| } |
| #if ENABLE_FEATURE_IPV6 |
| if (fromAddr.sa.sa_family == AF_INET6) { |
| //config->rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr); |
| config->port = ntohs(fromAddr.sin6.sin6_port); |
| } |
| #endif |
| |
| /* set the KEEPALIVE option to cull dead connections */ |
| setsockopt(s, SOL_SOCKET, SO_KEEPALIVE, &const_int_1, sizeof(const_int_1)); |
| |
| if (DEBUG || fork() == 0) { |
| /* child */ |
| #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP |
| /* protect reload config, may be confuse checking */ |
| signal(SIGHUP, SIG_IGN); |
| #endif |
| handleIncoming(); |
| if (!DEBUG) |
| exit(0); |
| } |
| close(s); |
| } /* while (1) */ |
| return 0; |
| } |
| |
| /* from inetd */ |
| static int miniHttpd_inetd(void) |
| { |
| union { |
| struct sockaddr sa; |
| struct sockaddr_in sin; |
| USE_FEATURE_IPV6(struct sockaddr_in6 sin6;) |
| } fromAddr; |
| socklen_t fromAddrLen = sizeof(fromAddr); |
| |
| getpeername(0, &fromAddr.sa, &fromAddrLen); |
| config->rmt_ip = 0; |
| config->port = 0; |
| #if ENABLE_FEATURE_HTTPD_CGI || DEBUG |
| free(config->rmt_ip_str); |
| config->rmt_ip_str = xmalloc_sockaddr2dotted(&fromAddr.sa, fromAddrLen); |
| #endif |
| if (fromAddr.sa.sa_family == AF_INET) { |
| config->rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr); |
| config->port = ntohs(fromAddr.sin.sin_port); |
| } |
| #if ENABLE_FEATURE_IPV6 |
| if (fromAddr.sa.sa_family == AF_INET6) { |
| //config->rmt_ip = ntohl(fromAddr.sin.sin_addr.s_addr); |
| config->port = ntohs(fromAddr.sin6.sin6_port); |
| } |
| #endif |
| handleIncoming(); |
| return 0; |
| } |
| |
| #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP |
| static void sighup_handler(int sig) |
| { |
| /* set and reset */ |
| struct sigaction sa; |
| |
| parse_conf(default_path_httpd_conf, sig == SIGHUP ? SIGNALED_PARSE : FIRST_PARSE); |
| sa.sa_handler = sighup_handler; |
| sigemptyset(&sa.sa_mask); |
| 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, |
| 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, |
| }; |
| |
| static const char httpd_opts[] = "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:if"; |
| |
| |
| int httpd_main(int argc, char *argv[]); |
| int httpd_main(int argc, char *argv[]) |
| { |
| unsigned opt; |
| const char *home_httpd = home; |
| char *url_for_decode; |
| USE_FEATURE_HTTPD_ENCODE_URL_STR(const char *url_for_encode;) |
| const char *s_port; |
| 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;) |
| |
| #if ENABLE_LOCALE_SUPPORT |
| /* Undo busybox.c: we want to speak English in http (dates etc) */ |
| setlocale(LC_TIME, "C"); |
| #endif |
| |
| config = xzalloc(sizeof(*config)); |
| #if ENABLE_FEATURE_HTTPD_BASIC_AUTH |
| config->realm = "Web Server Authentication"; |
| #endif |
| config->port = 80; |
| config->ContentLength = -1; |
| |
| opt = getopt32(argc, argv, httpd_opts, |
| &(config->configFile), &url_for_decode, &home_httpd |
| USE_FEATURE_HTTPD_ENCODE_URL_STR(, &url_for_encode) |
| USE_FEATURE_HTTPD_BASIC_AUTH(, &(config->realm)) |
| USE_FEATURE_HTTPD_AUTH_MD5(, &pass) |
| USE_FEATURE_HTTPD_SETUID(, &s_ugid) |
| , &s_port |
| ); |
| if (opt & OPT_DECODE_URL) { |
| printf("%s", decodeString(url_for_decode, 1)); |
| return 0; |
| } |
| #if ENABLE_FEATURE_HTTPD_ENCODE_URL_STR |
| if (opt & OPT_ENCODE_URL) { |
| printf("%s", encodeString(url_for_encode)); |
| return 0; |
| } |
| #endif |
| #if ENABLE_FEATURE_HTTPD_AUTH_MD5 |
| if (opt & OPT_MD5) { |
| puts(pw_encrypt(pass, "$1$")); |
| return 0; |
| } |
| #endif |
| if (opt & OPT_PORT) |
| config->port = xatou16(s_port); |
| |
| #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 |
| |
| xchdir(home_httpd); |
| if (!(opt & OPT_INETD)) { |
| signal(SIGCHLD, SIG_IGN); |
| config->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 ENABLE_FEATURE_HTTPD_CGI |
| { |
| char *p = getenv("PATH"); |
| p = xstrdup(p); /* if gets NULL, returns NULL */ |
| clearenv(); |
| if (p) |
| setenv1("PATH", p); |
| if (!(opt & OPT_INETD)) |
| setenv_long("SERVER_PORT", config->port); |
| } |
| #endif |
| |
| #if ENABLE_FEATURE_HTTPD_RELOAD_CONFIG_SIGHUP |
| sighup_handler(0); |
| #else |
| parse_conf(default_path_httpd_conf, FIRST_PARSE); |
| #endif |
| |
| if (opt & OPT_INETD) |
| return miniHttpd_inetd(); |
| |
| if (!(opt & OPT_FOREGROUND)) |
| xdaemon(1, 0); /* don't change current directory */ |
| return miniHttpd(config->server_socket); |
| } |