src/acl/ServerName.cc

   1 /*
   2  * Copyright (C) 1996-2016 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     char *s = reinterpret_cast<char *>(cn_data->data);
  75     char *d = cn;
  76     for (int i = 0; i < cn_data->length; ++i, ++d, ++s) {
  77         if (*s == '\0')
  78             return 1; // always a domain mismatch. contains 0x00
  79         *d = *s;
  80     }
  81     cn[cn_data->length] = '\0';
  82     debugs(28, 4, "Verifying certificate name/subjectAltName " << cn);
  83     if (data->match(cn))
  84         return 0;
  85     return 1;
  86 }
  87
  88 int
  89 ACLServerNameStrategy::match (ACLData<MatchType> * &data, ACLFilledChecklist *checklist, ACLFlags &flags)
  90 {
  91     assert(checklist != NULL && checklist->request != NULL);
  92
  93     if (checklist->conn() && checklist->conn()->serverBump()) {
  94         if (X509 *peer_cert = checklist->conn()->serverBump()->serverCert.get()) {
  95             if (Ssl::matchX509CommonNames(peer_cert, (void *)data, check_cert_domain<MatchType>))
  96                 return 1;
  97         }
  98     }
  99
 100     const char *serverName = NULL;
 101     if (checklist->conn() && !checklist->conn()->sslCommonName().isEmpty()) {
 102         SBuf scn = checklist->conn()->sslCommonName();
 103         serverName = scn.c_str();
 104     }
 105
 106     if (serverName == NULL)
 107         serverName = checklist->request->url.host();
 108
 109     if (serverName && data->match(serverName)) {
 110         return 1;
 111     }
 112
 113     return data->match("none");
 114 }
 115
 116 ACLServerNameStrategy *
 117 ACLServerNameStrategy::Instance()
 118 {
 119     return &Instance_;
 120 }
 121
 122 ACLServerNameStrategy ACLServerNameStrategy::Instance_;
 123