src/acl/ServerName.cc

   1 /*
   2  * Copyright (C) 1996-2015 The Squid Software Foundation and contributors
   3  *
   4  * Squid software is distributed under GPLv2+ license and includes
   5  * contributions from numerous individuals and organizations.
   6  * Please see the COPYING and CONTRIBUTORS files for details.
   7  */
   8
   9 /* DEBUG: section 28    Access Control */
  10
  11 #include "squid.h"
  12 #include "acl/Checklist.h"
  13 #include "acl/DomainData.h"
  14 #include "acl/RegexData.h"
  15 #include "acl/ServerName.h"
  16 #include "client_side.h"
  17 #include "fde.h"
  18 #include "HttpRequest.h"
  19 #include "ipcache.h"
  20 #include "SquidString.h"
  21 #include "ssl/bio.h"
  22 #include "ssl/ServerBump.h"
  23 #include "ssl/support.h"
  24 #include "URL.h"
  25
  26 // Compare function for tree search algorithms
  27 static int
  28 aclHostDomainCompare( char *const &a, char * const &b)
  29 {
  30     const char *h = static_cast<const char *>(a);
  31     const char *d = static_cast<const char *>(b);
  32     debugs(28, 7, "Match:" << h << " <>  " << d);
  33     return matchDomainName(h, d, true);
  34 }
  35
  36 bool
  37 ACLServerNameData::match(const char *host)
  38 {
  39     if (host == NULL)
  40         return 0;
  41
  42     debugs(28, 3, "checking '" << host << "'");
  43
  44     char *h = const_cast<char *>(host);
  45     char const * const * result = domains->find(h, aclHostDomainCompare);
  46
  47     debugs(28, 3, "'" << host << "' " << (result ? "found" : "NOT found"));
  48
  49     return (result != NULL);
  50
  51 }
  52
  53 ACLData<char const *> *
  54 ACLServerNameData::clone() const
  55 {
  56     /* Splay trees don't clone yet. */
  57     assert (!domains);
  58     return new ACLServerNameData;
  59 }
  60
  61 /// A helper function to be used with Ssl::matchX509CommonNames().
  62 /// \retval 0 when the name (cn or an alternate name) matches acl data
  63 /// \retval 1 when the name does not match
  64 template<class MatchType>
  65 int
  66 check_cert_domain( void *check_data, ASN1_STRING *cn_data)
  67 {
  68     char cn[1024];
  69     ACLData<MatchType> * data = (ACLData<MatchType> *)check_data;
  70
  71     if (cn_data->length > (int)sizeof(cn) - 1)
  72         return 1; // ignore data that does not fit our buffer
  73
  74     memcpy(cn, cn_data->data, cn_data->length);
  75     cn[cn_data->length] = '\0';
  76     debugs(28, 4, "Verifying certificate name/subjectAltName " << cn);
  77     if (data->match(cn))
  78         return 0;
  79     return 1;
  80 }
  81
  82 int
  83 ACLServerNameStrategy::match (ACLData<MatchType> * &data, ACLFilledChecklist *checklist, ACLFlags &flags)
  84 {
  85     assert(checklist != NULL && checklist->request != NULL);
  86
  87     if (checklist->conn() && checklist->conn()->serverBump()) {
  88         if (X509 *peer_cert = checklist->conn()->serverBump()->serverCert.get()) {
  89             if (Ssl::matchX509CommonNames(peer_cert, (void *)data, check_cert_domain<MatchType>))
  90                 return 1;
  91         }
  92     }
  93
  94     const char *serverName = NULL;
  95     if (checklist->conn() && !checklist->conn()->sslCommonName().isEmpty()) {
  96         SBuf scn = checklist->conn()->sslCommonName();
  97         serverName = scn.c_str();
  98     }
  99
 100     if (serverName == NULL)
 101         serverName = checklist->request->GetHost();
 102
 103     if (serverName && data->match(serverName)) {
 104         return 1;
 105     }
 106
 107     return data->match("none");
 108 }
 109
 110 ACLServerNameStrategy *
 111 ACLServerNameStrategy::Instance()
 112 {
 113     return &Instance_;
 114 }
 115
 116 ACLServerNameStrategy ACLServerNameStrategy::Instance_;
 117