aboutsummaryrefslogtreecommitdiffstats
path: root/src/lib/x509/x509_crl.cpp
blob: 3dcdeb10848d9a12926a282d5a5fb783dc30aa0a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
/*
* X.509 CRL
* (C) 1999-2007 Jack Lloyd
*
* Botan is released under the Simplified BSD License (see license.txt)
*/

#include <botan/x509_crl.h>
#include <botan/x509_ext.h>
#include <botan/x509cert.h>
#include <botan/ber_dec.h>

#include <sstream>

namespace Botan {

struct CRL_Data
   {
   X509_DN m_issuer;
   X509_Time m_this_update;
   X509_Time m_next_update;
   std::vector<CRL_Entry> m_entries;
   Extensions m_extensions;

   // cached values from extensions
   size_t m_crl_number = 0;
   std::vector<uint8_t> m_auth_key_id;
   std::string m_issuing_distribution_point;
   };

std::string X509_CRL::PEM_label() const
   {
   return "X509 CRL";
   }

std::vector<std::string> X509_CRL::alternate_PEM_labels() const
   {
   return { "CRL" };
   }

X509_CRL::X509_CRL(DataSource& src)
   {
   load_data(src);
   }

X509_CRL::X509_CRL(const std::vector<uint8_t>& vec)
   {
   DataSource_Memory src(vec.data(), vec.size());
   load_data(src);
   }

#if defined(BOTAN_TARGET_OS_HAS_FILESYSTEM)
X509_CRL::X509_CRL(const std::string& fsname)
   {
   DataSource_Stream src(fsname, true);
   load_data(src);
   }
#endif

X509_CRL::X509_CRL(const X509_DN& issuer,
                   const X509_Time& this_update,
                   const X509_Time& next_update,
                   const std::vector<CRL_Entry>& revoked) :
   X509_Object()
   {
   m_data = std::make_shared<CRL_Data>();
   m_data->m_issuer = issuer;
   m_data->m_this_update = this_update;
   m_data->m_next_update = next_update;
   m_data->m_entries = revoked;
   }

/**
* Check if this particular certificate is listed in the CRL
*/
bool X509_CRL::is_revoked(const X509_Certificate& cert) const
   {
   /*
   If the cert wasn't issued by the CRL issuer, it's possible the cert
   is revoked, but not by this CRL. Maybe throw an exception instead?
   */
   if(cert.issuer_dn() != issuer_dn())
      return false;

   std::vector<uint8_t> crl_akid = authority_key_id();
   std::vector<uint8_t> cert_akid = cert.authority_key_id();

   if(!crl_akid.empty() && !cert_akid.empty())
      {
      if(crl_akid != cert_akid)
         return false;
      }

   std::vector<uint8_t> cert_serial = cert.serial_number();

   bool is_revoked = false;

   // FIXME would be nice to avoid a linear scan here - maybe sort the entries?
   for(const CRL_Entry& entry : get_revoked())
      {
      if(cert_serial == entry.serial_number())
         {
         if(entry.reason_code() == CRL_Code::REMOVE_FROM_CRL)
            is_revoked = false;
         else
            is_revoked = true;
         }
      }

   return is_revoked;
   }

/*
* Decode the TBSCertList data
*/
namespace {

std::unique_ptr<CRL_Data> decode_crl_body(const std::vector<uint8_t>& body,
                                          const AlgorithmIdentifier& sig_algo)
   {
   auto data = std::make_unique<CRL_Data>();

   BER_Decoder tbs_crl(body);

   size_t version;
   tbs_crl.decode_optional(version, ASN1_Type::Integer, ASN1_Class::Universal);

   if(version != 0 && version != 1)
      throw Decoding_Error("Unknown X.509 CRL version " + std::to_string(version+1));

   AlgorithmIdentifier sig_algo_inner;
   tbs_crl.decode(sig_algo_inner);

   if(sig_algo != sig_algo_inner)
      throw Decoding_Error("Algorithm identifier mismatch in CRL");

   tbs_crl.decode(data->m_issuer)
      .decode(data->m_this_update)
      .decode(data->m_next_update);

   BER_Object next = tbs_crl.get_next_object();

   if(next.is_a(ASN1_Type::Sequence, ASN1_Class::Constructed))
      {
      BER_Decoder cert_list(std::move(next));

      while(cert_list.more_items())
         {
         CRL_Entry entry;
         cert_list.decode(entry);
         data->m_entries.push_back(entry);
         }
      next = tbs_crl.get_next_object();
      }

   if(next.is_a(0, ASN1_Class::Constructed | ASN1_Class::ContextSpecific))
      {
      BER_Decoder crl_options(std::move(next));
      crl_options.decode(data->m_extensions).verify_end();
      next = tbs_crl.get_next_object();
      }

   if(next.is_set())
      throw Decoding_Error("Unknown tag following extensions in CRL");

   tbs_crl.verify_end();

   // Now cache some fields from the extensions
   if(auto ext = data->m_extensions.get_extension_object_as<Cert_Extension::CRL_Number>())
      {
      data->m_crl_number = ext->get_crl_number();
      }
   if(auto ext = data->m_extensions.get_extension_object_as<Cert_Extension::Authority_Key_ID>())
      {
      data->m_auth_key_id = ext->get_key_id();
      }
   if(auto ext = data->m_extensions.get_extension_object_as<Cert_Extension::CRL_Issuing_Distribution_Point>())
      {
      std::stringstream ss;

      for(const auto& pair : ext->get_point().contents())
         {
         ss << pair.first << ": " << pair.second << " ";
         }
      data->m_issuing_distribution_point = ss.str();
      }

   return data;
   }

}

void X509_CRL::force_decode()
   {
   m_data.reset(decode_crl_body(signed_body(), signature_algorithm()).release());
   }

const CRL_Data& X509_CRL::data() const
   {
   if(!m_data)
      {
      throw Invalid_State("X509_CRL uninitialized");
      }
   return *m_data.get();
   }

const Extensions& X509_CRL::extensions() const
   {
   return data().m_extensions;
   }

/*
* Return the list of revoked certificates
*/
const std::vector<CRL_Entry>& X509_CRL::get_revoked() const
   {
   return data().m_entries;
   }

/*
* Return the distinguished name of the issuer
*/
const X509_DN& X509_CRL::issuer_dn() const
   {
   return data().m_issuer;
   }

/*
* Return the key identifier of the issuer
*/
const std::vector<uint8_t>& X509_CRL::authority_key_id() const
   {
   return data().m_auth_key_id;
   }

/*
* Return the CRL number of this CRL
*/
uint32_t X509_CRL::crl_number() const
   {
   return static_cast<uint32_t>(data().m_crl_number);
   }

/*
* Return the issue data of the CRL
*/
const X509_Time& X509_CRL::this_update() const
   {
   return data().m_this_update;
   }

/*
* Return the date when a new CRL will be issued
*/
const X509_Time& X509_CRL::next_update() const
   {
   return data().m_next_update;
   }

/*
* Return the CRL's distribution point
*/
std::string X509_CRL::crl_issuing_distribution_point() const
   {
   return data().m_issuing_distribution_point;
   }
}