src/modules/m_httpd_acl.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2010 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *          the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include "httpd.h"
  16 #include "protocol.h"
  17
  18 /* $ModDesc: Provides access control lists (passwording of resources, ip restrictions etc) to m_httpd.so dependent modules */
  19
  20 class HTTPACL
  21 {
  22  public:
  23         std::string path;
  24         std::string username;
  25         std::string password;
  26         std::string whitelist;
  27         std::string blacklist;
  28
  29         HTTPACL(const std::string &set_path, const std::string &set_username, const std::string &set_password,
  30                 const std::string &set_whitelist, const std::string &set_blacklist)
  31                 : path(set_path), username(set_username), password(set_password), whitelist(set_whitelist),
  32                 blacklist(set_blacklist) { }
  33
  34         ~HTTPACL() { }
  35 };
  36
  37 class ModuleHTTPAccessList : public Module
  38 {
  39
  40         std::string stylesheet;
  41         bool changed;
  42         std::vector<HTTPACL> acl_list;
  43
  44  public:
  45
  46         void ReadConfig()
  47         {
  48                 acl_list.clear();
  49                 ConfigReader c;
  50                 int n_items = c.Enumerate("httpdacl");
  51                 for (int i = 0; i < n_items; ++i)
  52                 {
  53                         std::string path = c.ReadValue("httpdacl", "path", i);
  54                         std::string types = c.ReadValue("httpdacl", "types", i);
  55                         irc::commasepstream sep(types);
  56                         std::string type;
  57                         std::string username;
  58                         std::string password;
  59                         std::string whitelist;
  60                         std::string blacklist;
  61
  62                         while (sep.GetToken(type))
  63                         {
  64                                 if (type == "password")
  65                                 {
  66                                         username = c.ReadValue("httpdacl", "username", i);
  67                                         password = c.ReadValue("httpdacl", "password", i);
  68                                 }
  69                                 else if (type == "whitelist")
  70                                 {
  71                                         whitelist = c.ReadValue("httpdacl", "whitelist", i);
  72                                 }
  73                                 else if (type == "blacklist")
  74                                 {
  75                                         blacklist = c.ReadValue("httpdacl", "blacklist", i);
  76                                 }
  77                                 else
  78                                 {
  79                                         throw ModuleException("Invalid HTTP ACL type '" + type + "'");
  80                                 }
  81                         }
  82
  83                         ServerInstance->Logs->Log("m_httpd_acl", DEBUG, "Read ACL: path=%s pass=%s whitelist=%s blacklist=%s", path.c_str(),
  84                                         password.c_str(), whitelist.c_str(), blacklist.c_str());
  85
  86                         acl_list.push_back(HTTPACL(path, username, password, whitelist, blacklist));
  87                 }
  88         }
  89
  90         ModuleHTTPAccessList()  {
  91                 ReadConfig();
  92                 Implementation eventlist[] = { I_OnEvent };
  93                 ServerInstance->Modules->Attach(eventlist, this, 1);
  94         }
  95
  96         void BlockAccess(HTTPRequest* http, int returnval, const std::string &extraheaderkey = "", const std::string &extraheaderval="")
  97         {
  98                 ServerInstance->Logs->Log("m_httpd_acl", DEBUG, "BlockAccess (%d)", returnval);
  99
 100                 std::stringstream data("Access to this resource is denied by an access control list. Please contact your IRC administrator.");
 101                 HTTPDocumentResponse response(this, *http, &data, returnval);
 102                 response.headers.SetHeader("X-Powered-By", "m_httpd_acl.so");
 103                 if (!extraheaderkey.empty())
 104                         response.headers.SetHeader(extraheaderkey, extraheaderval);
 105                 response.Send();
 106         }
 107
 108         bool IsBase64(unsigned char c)
 109         {
 110                 return (isalnum(c) || (c == '+') || (c == '/'));
 111         }
 112
 113         std::string Base64Decode(const std::string &base64)
 114         {
 115                 const std::string base64_chars("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/");
 116                 int inputlen = base64.length();
 117                 int i = 0, j = 0, input = 0;
 118                 unsigned char longbuf[4], shortbuf[3];
 119                 std::string retval;
 120
 121                 if (inputlen == 0)
 122                         return "";
 123
 124                 while (inputlen-- && (base64[input] != '=') && IsBase64(base64[input]))
 125                 {
 126                         longbuf[i++] = base64[input];
 127                         input++;
 128                         if (i == 4)
 129                         {
 130                                 for (i = 0; i < 4; ++i)
 131                                         longbuf[i] = base64_chars.find(longbuf[i]);
 132
 133                                 shortbuf[0] = (longbuf[0] << 2)         + ((longbuf[1] & 0x30) >> 4);
 134                                 shortbuf[1] = ((longbuf[1] & 0xf) << 4) + ((longbuf[2] & 0x3c) >> 2);
 135                                 shortbuf[2] = ((longbuf[2] & 0x3) << 6) + longbuf[3];
 136
 137                                 for (i = 0; i < 3; ++i)
 138                                         retval += shortbuf[i];
 139
 140                                 i = 0;
 141                         }
 142                 }
 143
 144                 if (i)
 145                 {
 146                         for (j = i; j < 4; ++j)
 147                                 longbuf[j] = 0;
 148
 149                         for (j = 0; j < 4; ++j)
 150                                 longbuf[j] = base64_chars.find(longbuf[j]);
 151
 152                         shortbuf[0] = (longbuf[0] << 2)         + ((longbuf[1] & 0x30) >> 4);
 153                         shortbuf[1] = ((longbuf[1] & 0xf) << 4) + ((longbuf[2] & 0x3c) >> 2);
 154                         shortbuf[2] = ((longbuf[2] & 0x3) << 6) + longbuf[3];
 155
 156                         for (j = 0; j < i - 1; ++j)
 157                                 retval += shortbuf[j];
 158                 }
 159
 160                 return retval;
 161         }
 162
 163         void OnEvent(Event& event)
 164         {
 165                 if (event.id == "httpd_acl")
 166                 {
 167                         ServerInstance->Logs->Log("m_http_stats", DEBUG,"Handling httpd acl event");
 168                         HTTPRequest* http = (HTTPRequest*)&event;
 169
 170                         for (std::vector<HTTPACL>::const_iterator this_acl = acl_list.begin(); this_acl != acl_list.end(); ++this_acl)
 171                         {
 172                                 if (InspIRCd::Match(http->GetURI(), this_acl->path, ascii_case_insensitive_map))
 173                                 {
 174                                         if (!this_acl->blacklist.empty())
 175                                         {
 176                                                 /* Blacklist */
 177                                                 irc::commasepstream sep(this_acl->blacklist);
 178                                                 std::string entry;
 179
 180                                                 while (sep.GetToken(entry))
 181                                                 {
 182                                                         if (InspIRCd::Match(http->GetIP(), entry, ascii_case_insensitive_map))
 183                                                         {
 184                                                                 ServerInstance->Logs->Log("m_httpd_acl", DEBUG, "Denying access to blacklisted resource %s (matched by pattern %s) from ip %s (matched by entry %s)",
 185                                                                                 http->GetURI().c_str(), this_acl->path.c_str(), http->GetIP().c_str(), entry.c_str());
 186                                                                 BlockAccess(http, 403);
 187                                                                 return;
 188                                                         }
 189                                                 }
 190                                         }
 191                                         if (!this_acl->whitelist.empty())
 192                                         {
 193                                                 /* Whitelist */
 194                                                 irc::commasepstream sep(this_acl->whitelist);
 195                                                 std::string entry;
 196                                                 bool allow_access = false;
 197
 198                                                 while (sep.GetToken(entry))
 199                                                 {
 200                                                         if (InspIRCd::Match(http->GetIP(), entry, ascii_case_insensitive_map))
 201                                                                 allow_access = true;
 202                                                 }
 203
 204                                                 if (!allow_access)
 205                                                 {
 206                                                         ServerInstance->Logs->Log("m_httpd_acl", DEBUG, "Denying access to whitelisted resource %s (matched by pattern %s) from ip %s (Not in whitelist)",
 207                                                                         http->GetURI().c_str(), this_acl->path.c_str(), http->GetIP().c_str());
 208                                                         BlockAccess(http, 403);
 209                                                         return;
 210                                                 }
 211                                         }
 212                                         if (!this_acl->password.empty() && !this_acl->username.empty())
 213                                         {
 214                                                 /* Password auth, first look to see if we have a basic authentication header */
 215                                                 ServerInstance->Logs->Log("m_httpd_acl", DEBUG, "Checking HTTP auth password for resource %s (matched by pattern %s) from ip %s, against username %s",
 216                                                                 http->GetURI().c_str(), this_acl->path.c_str(), http->GetIP().c_str(), this_acl->username.c_str());
 217
 218                                                 if (http->headers->IsSet("Authorization"))
 219                                                 {
 220                                                         /* Password has been given, validate it */
 221                                                         std::string authorization = http->headers->GetHeader("Authorization");
 222                                                         irc::spacesepstream sep(authorization);
 223                                                         std::string authtype;
 224                                                         std::string base64;
 225
 226                                                         sep.GetToken(authtype);
 227                                                         if (authtype == "Basic")
 228                                                         {
 229                                                                 std::string user;
 230                                                                 std::string pass;
 231
 232                                                                 sep.GetToken(base64);
 233                                                                 std::string userpass = Base64Decode(base64);
 234                                                                 ServerInstance->Logs->Log("m_httpd_acl", DEBUG, "HTTP authorization: %s (%s)", userpass.c_str(), base64.c_str());
 235
 236                                                                 irc::sepstream userpasspair(userpass, ':');
 237                                                                 if (userpasspair.GetToken(user))
 238                                                                 {
 239                                                                         userpasspair.GetToken(pass);
 240
 241                                                                         /* Access granted if username and password are correct */
 242                                                                         if (user == this_acl->username && pass == this_acl->password)
 243                                                                         {
 244                                                                                 ServerInstance->Logs->Log("m_httpd_acl", DEBUG, "HTTP authorization: password and username match");
 245                                                                                 return;
 246                                                                         }
 247                                                                         else
 248                                                                                 /* Invalid password */
 249                                                                                 BlockAccess(http, 401, "WWW-Authenticate", "Basic realm=\"Restricted Object\"");
 250                                                                 }
 251                                                                 else
 252                                                                         /* Malformed user:pass pair */
 253                                                                         BlockAccess(http, 401, "WWW-Authenticate", "Basic realm=\"Restricted Object\"");
 254                                                         }
 255                                                         else
 256                                                                 /* Unsupported authentication type */
 257                                                                 BlockAccess(http, 401, "WWW-Authenticate", "Basic realm=\"Restricted Object\"");
 258                                                 }
 259                                                 else
 260                                                 {
 261                                                         /* No password given at all, access denied */
 262                                                         BlockAccess(http, 401, "WWW-Authenticate", "Basic realm=\"Restricted Object\"");
 263                                                 }
 264                                         }
 265
 266                                         /* A path may only match one ACL (the first it finds in the config file) */
 267                                         return;
 268                                 }
 269                         }
 270                 }
 271         }
 272
 273         virtual ~ModuleHTTPAccessList()
 274         {
 275         }
 276
 277         virtual Version GetVersion()
 278         {
 279                 return Version("Provides access control lists (passwording of resources, ip restrictions etc) to m_httpd.so dependent modules", VF_VENDOR);
 280         }
 281 };
 282
 283 MODULE_INIT(ModuleHTTPAccessList)