KeyData.cc
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1 /*
2  * Copyright (C) 1996-2018 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 #include "squid.h"
10 #include "anyp/PortCfg.h"
11 #include "fatal.h"
12 #include "security/KeyData.h"
13 #include "SquidConfig.h"
14 #include "ssl/bio.h"
15 
20 bool
22 {
23  debugs(83, DBG_IMPORTANT, "Using certificate in " << certFile);
24  cert.reset(); // paranoid: ensure cert is unset
25 
26 #if USE_OPENSSL
27  const char *certFilename = certFile.c_str();
28  Ssl::BIO_Pointer bio(BIO_new(BIO_s_file()));
29  if (!bio || !BIO_read_filename(bio.get(), certFilename)) {
30  const auto x = ERR_get_error();
31  debugs(83, DBG_IMPORTANT, "ERROR: unable to load certificate file '" << certFile << "': " << ErrorString(x));
32  return false;
33  }
34 
35  if (X509 *certificate = PEM_read_bio_X509(bio.get(), nullptr, nullptr, nullptr)) {
36  cert.resetWithoutLocking(certificate);
37  }
38 
39 #elif USE_GNUTLS
40  const char *certFilename = certFile.c_str();
41  gnutls_datum_t data;
42  Security::ErrorCode x = gnutls_load_file(certFilename, &data);
43  if (x != GNUTLS_E_SUCCESS) {
44  debugs(83, DBG_IMPORTANT, "ERROR: unable to load certificate file '" << certFile << "': " << ErrorString(x));
45  return false;
46  }
47 
48  gnutls_pcert_st pcrt;
49  x = gnutls_pcert_import_x509_raw(&pcrt, &data, GNUTLS_X509_FMT_PEM, 0);
50  if (x != GNUTLS_E_SUCCESS) {
51  debugs(83, DBG_IMPORTANT, "ERROR: unable to import certificate from '" << certFile << "': " << ErrorString(x));
52  return false;
53  }
54  gnutls_free(data.data);
55 
56  gnutls_x509_crt_t certificate;
57  x = gnutls_pcert_export_x509(&pcrt, &certificate);
58  if (x != GNUTLS_E_SUCCESS) {
59  debugs(83, DBG_IMPORTANT, "ERROR: unable to X.509 convert certificate from '" << certFile << "': " << ErrorString(x));
60  return false;
61  }
62 
63  if (certificate) {
64  cert = Security::CertPointer(certificate, [](gnutls_x509_crt_t p) {
65  debugs(83, 5, "gnutls_x509_crt_deinit cert=" << (void*)p);
66  gnutls_x509_crt_deinit(p);
67  });
68  }
69 
70 #else
71  // do nothing.
72 #endif
73 
74  if (!cert) {
75  debugs(83, DBG_IMPORTANT, "ERROR: unable to load certificate from '" << certFile << "'");
76  }
77 
78  return bool(cert);
79 }
80 
85 void
87 {
88 #if USE_OPENSSL
89  // XXX: This BIO loads the public cert as first chain cert,
90  // so the code appending chains sends it twice in handshakes.
91  const char *certFilename = certFile.c_str();
92  Ssl::BIO_Pointer bio(BIO_new(BIO_s_file()));
93  if (!bio || !BIO_read_filename(bio.get(), certFilename)) {
94  const auto x = ERR_get_error();
95  debugs(83, DBG_IMPORTANT, "ERROR: unable to load chain file '" << certFile << "': " << ErrorString(x));
96  return;
97  }
98 
99  if (X509_check_issued(cert.get(), cert.get()) == X509_V_OK)
100  debugs(83, 5, "Certificate is self-signed, will not be chained");
101  else {
102  // and add to the chain any other certificate exist in the file
103  while (X509 *ca = PEM_read_bio_X509(bio.get(), nullptr, nullptr, nullptr)) {
104  // XXX: self-signed check should be applied to all certs loaded.
105  // XXX: missing checks that the chained certs are actually part of a chain for validating cert.
106  chain.emplace_front(Security::CertPointer(ca));
107  }
108  }
109 
110 #elif USE_GNUTLS
111  // XXX: implement chain loading
112  debugs(83, 2, "Loading certificate chain from PEM files not implemented in this Squid.");
113 
114 #else
115  // nothing to do.
116 #endif
117 }
118 
122 bool
124 {
125  debugs(83, DBG_IMPORTANT, "Using key in " << privateKeyFile);
126 
127 #if USE_OPENSSL
128  const char *keyFilename = privateKeyFile.c_str();
129  // XXX: Ssl::AskPasswordCb needs SSL_CTX_set_default_passwd_cb_userdata()
130  // so this may not fully work iff Config.Program.ssl_password is set.
131  pem_password_cb *cb = ::Config.Program.ssl_password ? &Ssl::AskPasswordCb : nullptr;
132  Ssl::ReadPrivateKeyFromFile(keyFilename, pkey, cb);
133 
134  if (pkey && !X509_check_private_key(cert.get(), pkey.get())) {
135  debugs(83, DBG_IMPORTANT, "WARNING: '" << privateKeyFile << "' X509_check_private_key() failed");
136  pkey.reset();
137  }
138 
139 #elif USE_GNUTLS
140  const char *keyFilename = privateKeyFile.c_str();
141  gnutls_datum_t data;
142  if (gnutls_load_file(keyFilename, &data) == GNUTLS_E_SUCCESS) {
143  gnutls_privkey_t key;
144  (void)gnutls_privkey_init(&key);
145  Security::ErrorCode x = gnutls_privkey_import_x509_raw(key, &data, GNUTLS_X509_FMT_PEM, nullptr, 0);
146  if (x == GNUTLS_E_SUCCESS) {
147  gnutls_x509_privkey_t xkey;
148  gnutls_privkey_export_x509(key, &xkey);
149  gnutls_privkey_deinit(key);
150  pkey = Security::PrivateKeyPointer(xkey, [](gnutls_x509_privkey_t p) {
151  debugs(83, 5, "gnutls_x509_privkey_deinit pkey=" << (void*)p);
152  gnutls_x509_privkey_deinit(p);
153  });
154  }
155  }
156  gnutls_free(data.data);
157 
158 #else
159  // nothing to do.
160 #endif
161 
162  return bool(pkey);
163 }
164 
165 void
167 {
168  char buf[128];
169  if (!loadX509CertFromFile()) {
170  debugs(83, DBG_IMPORTANT, "WARNING: '" << portType << "_port " << port.s.toUrl(buf, sizeof(buf)) << "' missing certificate in '" << certFile << "'");
171  return;
172  }
173 
174  // certificate chain in the PEM file is optional
175  loadX509ChainFromFile();
176 
177  // pkey is mandatory, not having it makes cert and chain pointless.
178  if (!loadX509PrivateKeyFromFile()) {
179  debugs(83, DBG_IMPORTANT, "WARNING: '" << portType << "_port " << port.s.toUrl(buf, sizeof(buf)) << "' missing private key in '" << privateKeyFile << "'");
180  cert.reset();
181  chain.clear();
182  }
183 }
184 
Ip::Address s
Definition: PortCfg.h:31
SBuf certFile
path of file containing PEM format X.509 certificate
Definition: KeyData.h:27
Security::CertPointer cert
public X.509 certificate from certFile
Definition: KeyData.h:31
int AskPasswordCb(char *buf, int size, int rwflag, void *userdata)
Definition: support.cc:63
char * p
Definition: membanger.c:43
void loadFromFiles(const AnyP::PortCfg &, const char *portType)
load the contents of certFile and privateKeyFile into memory cert, pkey and chain ...
Definition: KeyData.cc:166
char * ssl_password
Definition: SquidConfig.h:200
void const char HLPCB void * data
Definition: stub_helper.cc:16
#define debugs(SECTION, LEVEL, CONTENT)
Definition: Debug.h:121
#define DBG_IMPORTANT
Definition: Debug.h:46
int ErrorCode
Squid defined error code (<0), an error code returned by X.509 API, or SSL_ERROR_NONE.
Definition: forward.h:115
char * toUrl(char *buf, unsigned int len) const
Definition: Address.cc:877
void loadX509ChainFromFile()
Definition: KeyData.cc:86
const char * c_str()
Definition: SBuf.cc:539
std::unique_ptr< BIO, HardFun< void, BIO *,&BIO_vfree > > BIO_Pointer
Definition: gadgets.h:50
static int port
Definition: ldap_backend.cc:69
void const char * buf
Definition: stub_helper.cc:16
struct SquidConfig::@104 Program
void ReadPrivateKeyFromFile(char const *keyFilename, Security::PrivateKeyPointer &pkey, pem_password_cb *passwd_callback)
Definition: gadgets.cc:729
bool loadX509CertFromFile()
Definition: KeyData.cc:21
bool loadX509PrivateKeyFromFile()
Definition: KeyData.cc:123
const char * ErrorString(const ErrorCode code)
Definition: forward.h:120
class SquidConfig Config
Definition: SquidConfig.cc:12

 

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