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/* |
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** Copyright (c) 2007 D. Richard Hipp |
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** |
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** This program is free software; you can redistribute it and/or |
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** modify it under the terms of the Simplified BSD License (also |
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** known as the "2-Clause License" or "FreeBSD License".) |
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** |
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** This program is distributed in the hope that it will be useful, |
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** but without any warranty; without even the implied warranty of |
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** merchantability or fitness for a particular purpose. |
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** |
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** Author contact information: |
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** [email protected] |
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** http://www.hwaci.com/drh/ |
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** |
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******************************************************************************* |
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** |
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** This file contains code to implement the /aux webpage. |
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** |
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** The /aux webpage acts like a recursive webserver, relaying the |
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** HTTP request to some other component - usually another CGI. |
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** |
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** Before doing the relay, /aux examines the login cookie to see |
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** if the HTTP request is coming from a validaded user, and if so |
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** /aux sets some additional environment variables that the child |
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** CGI script can use. In this way, the child CGI scripts use the |
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** same login system as the main repository, and appear to be |
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** an integrated part of the repository. |
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*/ |
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#include "config.h" |
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#include "auxwww.h" |
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#include <assert.h> |
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/* |
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** WEBPAGE: aux |
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** |
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** Relay an HTTP request to secondary CGI after first checking the |
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** login credentials and setting auxiliary environment variables |
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** so that the secondary CGI can be aware of the credentials and |
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** capabilities of the Fossil user. |
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** |
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** The /aux page is only functional if the "auxroot: DIR" setting is |
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** found in the CGI script that launched Fossil, or if the "--auxroot DIR" |
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** flag is present when Fossil is lauched using the "server", "ui", or |
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** "http" commands. DIR must be an absolute pathname (relative to the |
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** chroot jail) of the root of the file hierarchy that implements the CGI |
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** functionality. Executable files are CGI. Non-executable files are |
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** static content. |
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** |
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** The path after the /aux is the path to the CGI script or static file |
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** relative to DIR. For security, this path may not contain characters |
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** other than ASCII letters or digits, ".", "-", "/", and "_". If the |
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** "." or "-" characters are present in the path then they may not follow |
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** a "/". |
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*/ |
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void aux_page(void){ |
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const char *zName = P("name"); /* Path information after /aux */ |
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char *zPath = 0; /* Complete path from auxroot */ |
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int nRoot; /* Number of bytes in the auxroot name */ |
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char *zScript = 0; /* Name of the CGI script */ |
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int nScript = 0; /* Bytes in the CGI script name */ |
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const char *zFailReason = "???";/* Reason for failure */ |
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int i; /* Loop counter */ |
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if( g.zAuxRoot==0 ){ |
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zFailReason = "auxroot is not set"; |
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goto aux_not_found; |
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} |
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if( file_is_absolute_path(g.zAuxRoot)==0 ){ |
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zFailReason = "auxroot is a relative pathname"; |
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goto aux_not_found; |
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} |
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if( zName==0 ){ |
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zFailReason = "no path beyond /aux"; |
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goto aux_not_found; |
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} |
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if( file_isdir(g.zAuxRoot,ExtFILE)!=1 ){ |
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zFailReason = "auxroot is not a directory"; |
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goto aux_not_found; |
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} |
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zPath = mprintf("%s/%s", g.zAuxRoot, zName); |
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nRoot = (int)strlen(g.zAuxRoot); |
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if( file_isfile(zPath, ExtFILE) ){ |
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nScript = (int)strlen(zPath); |
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zScript = zPath; |
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}else{ |
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for(i=nRoot+1; zPath[i]; i++){ |
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char c = zPath[i]; |
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if( (c=='.' || c=='-') && zPath[i-1]=='/' ){ |
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zFailReason = "path element begins with '.' or '-'"; |
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goto aux_not_found; |
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} |
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if( !fossil_isalnum(c) && c!='_' && c!='-' && c!='.' ){ |
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zFailReason = "illegal character in path"; |
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goto aux_not_found; |
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} |
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if( c=='/' ){ |
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int isDir, isFile; |
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zPath[i] = 0; |
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isDir = file_isdir(zPath, ExtFILE); |
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isFile = isDir==2 ? file_isfile(zPath, ExtFILE) : 0; |
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zPath[i] = c; |
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if( isDir==0 ){ |
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zFailReason = "path does not match any file or script"; |
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goto aux_not_found; |
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} |
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if( isFile!=0 ){ |
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zScript = mprintf("%.*s", i, zPath); |
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nScript = i; |
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break; |
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} |
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} |
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} |
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} |
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if( nScript==0 ){ |
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zFailReason = "path does not match any file or script"; |
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goto aux_not_found; |
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} |
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if( !file_isexe(zScript, ExtFILE) ){ |
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const char *zMime; |
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/* File is not executable. Must be a regular file. In that case, |
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** disallow extra path elements */ |
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if( zPath[nScript]!=0 ){ |
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zFailReason = "extra path elements after filename"; |
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goto aux_not_found; |
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} |
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zMime = mimetype_from_name(zScript); |
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if( zMime==0 ) zMime = "application/octet-stream"; |
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cgi_set_content_type(zMime); |
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blob_read_from_file(cgi_output_blob(), zScript, ExtFILE); |
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return; |
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} |
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/* If we reach this point, that means we are dealing with an executable |
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** file name zScript. Run that file as CGI. */ |
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login_check_credentials(); |
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aux_not_found: |
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fossil_free(zPath); |
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cgi_set_status(404, "Not Found"); |
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@ %h(zFailReason) |
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return; |
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} |
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