src/modules/m_httpd_acl.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2008 Craig Edwards <craigedwards@brainbox.cc>
   6  *
   7  * This file is part of InspIRCd.  InspIRCd is free software: you can
   8  * redistribute it and/or modify it under the terms of the GNU General Public
   9  * License as published by the Free Software Foundation, version 2.
  10  *
  11  * This program is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  13  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  14  * details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20
  21 #include "inspircd.h"
  22 #include "httpd.h"
  23 #include "protocol.h"
  24
  25 /* $ModDesc: Provides access control lists (passwording of resources, ip restrictions etc) to m_httpd.so dependent modules */
  26
  27 class HTTPACL
  28 {
  29  public:
  30         std::string path;
  31         std::string username;
  32         std::string password;
  33         std::string whitelist;
  34         std::string blacklist;
  35
  36         HTTPACL(const std::string &set_path, const std::string &set_username, const std::string &set_password,
  37                 const std::string &set_whitelist, const std::string &set_blacklist)
  38                 : path(set_path), username(set_username), password(set_password), whitelist(set_whitelist),
  39                 blacklist(set_blacklist) { }
  40 };
  41
  42 class ModuleHTTPAccessList : public Module
  43 {
  44         std::string stylesheet;
  45         std::vector<HTTPACL> acl_list;
  46
  47  public:
  48         void ReadConfig()
  49         {
  50                 acl_list.clear();
  51                 ConfigTagList acls = ServerInstance->Config->ConfTags("httpdacl");
  52                 for (ConfigIter i = acls.first; i != acls.second; i++)
  53                 {
  54                         ConfigTag* c = i->second;
  55                         std::string path = c->getString("path");
  56                         std::string types = c->getString("types");
  57                         irc::commasepstream sep(types);
  58                         std::string type;
  59                         std::string username;
  60                         std::string password;
  61                         std::string whitelist;
  62                         std::string blacklist;
  63
  64                         while (sep.GetToken(type))
  65                         {
  66                                 if (type == "password")
  67                                 {
  68                                         username = c->getString("username");
  69                                         password = c->getString("password");
  70                                 }
  71                                 else if (type == "whitelist")
  72                                 {
  73                                         whitelist = c->getString("whitelist");
  74                                 }
  75                                 else if (type == "blacklist")
  76                                 {
  77                                         blacklist = c->getString("blacklist");
  78                                 }
  79                                 else
  80                                 {
  81                                         throw ModuleException("Invalid HTTP ACL type '" + type + "'");
  82                                 }
  83                         }
  84
  85                         ServerInstance->Logs->Log("m_httpd_acl", LOG_DEBUG, "Read ACL: path=%s pass=%s whitelist=%s blacklist=%s", path.c_str(),
  86                                         password.c_str(), whitelist.c_str(), blacklist.c_str());
  87
  88                         acl_list.push_back(HTTPACL(path, username, password, whitelist, blacklist));
  89                 }
  90         }
  91
  92         void init()
  93         {
  94                 ReadConfig();
  95                 Implementation eventlist[] = { I_OnEvent };
  96                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
  97         }
  98
  99         void BlockAccess(HTTPRequest* http, int returnval, const std::string &extraheaderkey = "", const std::string &extraheaderval="")
 100         {
 101                 ServerInstance->Logs->Log("m_httpd_acl", LOG_DEBUG, "BlockAccess (%d)", returnval);
 102
 103                 std::stringstream data("Access to this resource is denied by an access control list. Please contact your IRC administrator.");
 104                 HTTPDocumentResponse response(this, *http, &data, returnval);
 105                 response.headers.SetHeader("X-Powered-By", "m_httpd_acl.so");
 106                 if (!extraheaderkey.empty())
 107                         response.headers.SetHeader(extraheaderkey, extraheaderval);
 108                 response.Send();
 109         }
 110
 111         void OnEvent(Event& event)
 112         {
 113                 if (event.id == "httpd_acl")
 114                 {
 115                         ServerInstance->Logs->Log("m_http_stats", LOG_DEBUG,"Handling httpd acl event");
 116                         HTTPRequest* http = (HTTPRequest*)&event;
 117
 118                         for (std::vector<HTTPACL>::const_iterator this_acl = acl_list.begin(); this_acl != acl_list.end(); ++this_acl)
 119                         {
 120                                 if (InspIRCd::Match(http->GetURI(), this_acl->path, ascii_case_insensitive_map))
 121                                 {
 122                                         if (!this_acl->blacklist.empty())
 123                                         {
 124                                                 /* Blacklist */
 125                                                 irc::commasepstream sep(this_acl->blacklist);
 126                                                 std::string entry;
 127
 128                                                 while (sep.GetToken(entry))
 129                                                 {
 130                                                         if (InspIRCd::Match(http->GetIP(), entry, ascii_case_insensitive_map))
 131                                                         {
 132                                                                 ServerInstance->Logs->Log("m_httpd_acl", LOG_DEBUG, "Denying access to blacklisted resource %s (matched by pattern %s) from ip %s (matched by entry %s)",
 133                                                                                 http->GetURI().c_str(), this_acl->path.c_str(), http->GetIP().c_str(), entry.c_str());
 134                                                                 BlockAccess(http, 403);
 135                                                                 return;
 136                                                         }
 137                                                 }
 138                                         }
 139                                         if (!this_acl->whitelist.empty())
 140                                         {
 141                                                 /* Whitelist */
 142                                                 irc::commasepstream sep(this_acl->whitelist);
 143                                                 std::string entry;
 144                                                 bool allow_access = false;
 145
 146                                                 while (sep.GetToken(entry))
 147                                                 {
 148                                                         if (InspIRCd::Match(http->GetIP(), entry, ascii_case_insensitive_map))
 149                                                                 allow_access = true;
 150                                                 }
 151
 152                                                 if (!allow_access)
 153                                                 {
 154                                                         ServerInstance->Logs->Log("m_httpd_acl", LOG_DEBUG, "Denying access to whitelisted resource %s (matched by pattern %s) from ip %s (Not in whitelist)",
 155                                                                         http->GetURI().c_str(), this_acl->path.c_str(), http->GetIP().c_str());
 156                                                         BlockAccess(http, 403);
 157                                                         return;
 158                                                 }
 159                                         }
 160                                         if (!this_acl->password.empty() && !this_acl->username.empty())
 161                                         {
 162                                                 /* Password auth, first look to see if we have a basic authentication header */
 163                                                 ServerInstance->Logs->Log("m_httpd_acl", LOG_DEBUG, "Checking HTTP auth password for resource %s (matched by pattern %s) from ip %s, against username %s",
 164                                                                 http->GetURI().c_str(), this_acl->path.c_str(), http->GetIP().c_str(), this_acl->username.c_str());
 165
 166                                                 if (http->headers->IsSet("Authorization"))
 167                                                 {
 168                                                         /* Password has been given, validate it */
 169                                                         std::string authorization = http->headers->GetHeader("Authorization");
 170                                                         irc::spacesepstream sep(authorization);
 171                                                         std::string authtype;
 172                                                         std::string base64;
 173
 174                                                         sep.GetToken(authtype);
 175                                                         if (authtype == "Basic")
 176                                                         {
 177                                                                 std::string user;
 178                                                                 std::string pass;
 179
 180                                                                 sep.GetToken(base64);
 181                                                                 std::string userpass = Base64ToBin(base64);
 182                                                                 ServerInstance->Logs->Log("m_httpd_acl", LOG_DEBUG, "HTTP authorization: %s (%s)", userpass.c_str(), base64.c_str());
 183
 184                                                                 irc::sepstream userpasspair(userpass, ':');
 185                                                                 if (userpasspair.GetToken(user))
 186                                                                 {
 187                                                                         userpasspair.GetToken(pass);
 188
 189                                                                         /* Access granted if username and password are correct */
 190                                                                         if (user == this_acl->username && pass == this_acl->password)
 191                                                                         {
 192                                                                                 ServerInstance->Logs->Log("m_httpd_acl", LOG_DEBUG, "HTTP authorization: password and username match");
 193                                                                                 return;
 194                                                                         }
 195                                                                         else
 196                                                                                 /* Invalid password */
 197                                                                                 BlockAccess(http, 401, "WWW-Authenticate", "Basic realm=\"Restricted Object\"");
 198                                                                 }
 199                                                                 else
 200                                                                         /* Malformed user:pass pair */
 201                                                                         BlockAccess(http, 401, "WWW-Authenticate", "Basic realm=\"Restricted Object\"");
 202                                                         }
 203                                                         else
 204                                                                 /* Unsupported authentication type */
 205                                                                 BlockAccess(http, 401, "WWW-Authenticate", "Basic realm=\"Restricted Object\"");
 206                                                 }
 207                                                 else
 208                                                 {
 209                                                         /* No password given at all, access denied */
 210                                                         BlockAccess(http, 401, "WWW-Authenticate", "Basic realm=\"Restricted Object\"");
 211                                                 }
 212                                         }
 213
 214                                         /* A path may only match one ACL (the first it finds in the config file) */
 215                                         return;
 216                                 }
 217                         }
 218                 }
 219         }
 220
 221         virtual Version GetVersion()
 222         {
 223                 return Version("Provides access control lists (passwording of resources, ip restrictions etc) to m_httpd.so dependent modules", VF_VENDOR);
 224         }
 225 };
 226
 227 MODULE_INIT(ModuleHTTPAccessList)