Mercurial > trustbridge

annotate common/binverify.c @ 726:3777482dc306

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Merged
author Sascha Wilde <wilde@intevation.de>
date Wed, 02 Jul 2014 19:32:16 +0200
parents be30d50bc4f0
children 2798f1869eee
rev   line source
579
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
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1 /* Copyright (C) 2014 by Bundesamt für Sicherheit in der Informationstechnik
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2 * Software engineering by Intevation GmbH
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3 *
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4 * This file is Free Software under the GNU GPL (v>=2)
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5 * and comes with ABSOLUTELY NO WARRANTY!
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6 * See LICENSE.txt for details.
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7 */
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8
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9 #include "binverify.h"
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10
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11 #include "strhelp.h"
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12 #include "logging.h"
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13
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14 #ifdef RELEASE_BUILD
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15 #include "pubkey-release.h"
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16 #else
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17 #include "pubkey-test.h"
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18 #endif
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19
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20 bin_verify_result
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21 verify_binary(const char *filename, size_t name_len) {
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22 #ifdef WIN32
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23 return verify_binary_win(filename, name_len);
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24 #else
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25 /* TODO */
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26 if (filename && name_len)
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27 return VerifyValid;
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28 return VerifyUnknownError;
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29 #endif
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30 }
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31
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32 #ifdef WIN32
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33
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34 #include <polarssl/x509_crt.h>
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35
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36 #include <windows.h>
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37 #include <wincrypt.h>
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38 #include <wintrust.h>
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39 #include <stdio.h>
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40
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41
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42 /** @brief Check if the certificate @a pCCertContext is pinned
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43 *
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44 * Compares the certificate's binary data (public key and attributes)
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45 * with each other to validate that the certificate pCCertContext has
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46 * exactly the same data as the builtin public certificate.
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47 *
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48 * @param[in] pCCertContext pointer to the certificate to check
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49 *
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50 * @returns true if the certificate matches, false otherwise.
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51 */
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52 static bool
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53 check_certificate (PCCERT_CONTEXT pCCertContext)
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54 {
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55 x509_crt codesign_cert;
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56 int ret = 0;
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57 DWORD dwI = 0;
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58 bool retval = false;
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59
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60 if (pCCertContext == NULL)
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61 {
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62 ERRORPRINTF ("Invalid call to check_certificate");
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63 return false;
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64 }
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65
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66 x509_crt_init(&codesign_cert);
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67
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68 /* Parse the pinned certificate */
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69 ret = x509_crt_parse(&codesign_cert,
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70 public_key_codesign_pem,
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71 public_key_codesign_pem_size);
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72 if (ret != 0)
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73 {
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74 ERRORPRINTF ("x509_crt_parse failed with -0x%04x\n\n", -ret);
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75 goto done;
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76 }
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77
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78 if (codesign_cert.raw.len != pCCertContext->cbCertEncoded ||
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79 codesign_cert.raw.len <= 0)
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80 {
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81 ERRORPRINTF ("Certificate size mismatch");
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82 goto done;
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83 }
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84
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85 /* Check that the certificate is exactly the same as the pinned one */
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86 for (dwI = 0; dwI < pCCertContext->cbCertEncoded; dwI++)
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87 {
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88 if (pCCertContext->pbCertEncoded[dwI] != codesign_cert.raw.p[dwI])
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89 {
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90 ERRORPRINTF ("Certificate content mismatch");
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91 goto done;
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92 }
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93 }
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94
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95 retval = true;
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96
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97 done:
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98 x509_crt_free(&codesign_cert);
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99 return retval;
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100 }
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101
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102 bin_verify_result
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103 verify_binary_win(const char *filename, size_t name_len) {
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104 bin_verify_result retval = VerifyUnknownError;
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105 WCHAR *filenameW = NULL;
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106 BOOL result = FALSE;
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107 DWORD dwEncoding = 0,
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108 dwContentType = 0,
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109 dwFormatType = 0,
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110 dwSignerInfoSize = 0;
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111 HCERTSTORE hStore = NULL;
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112 HCRYPTMSG hMsg = NULL;
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113 PCERT_INFO pSignerCert = NULL;
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114 PCCERT_CONTEXT pSignerCertContext = NULL;
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115
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116 if (!filename || name_len > MAX_PATH || strlen(filename) != name_len)
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117 {
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118 ERRORPRINTF ("Invalid parameters\n");
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119 return VerifyUnknownError;
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120 }
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121
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122 filenameW = utf8_to_wchar(filename, name_len);
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123
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124 result = CryptQueryObject (CERT_QUERY_OBJECT_FILE,
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125 filenameW,
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126 CERT_QUERY_CONTENT_FLAG_PKCS7_SIGNED_EMBED,
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127 CERT_QUERY_FORMAT_FLAG_BINARY,
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128 0,
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129 &dwEncoding,
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130 &dwContentType,
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131 &dwFormatType,
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132 &hStore,
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133 &hMsg,
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diff changeset
134 NULL);
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
135
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
136 if (!result || !hMsg)
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
137 {
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
138 PRINTLASTERROR ("Failed to query crypto object");
586
ecfd77751daf Disambiguate enumerator values and add portable wrapper.
Andre Heinecke <aheinecke@intevation.de>
parents: 579
diff changeset
139 retval = VerifyReadFailed;
579
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
140 goto done;
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
141 }
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
142
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
143 /* Get the cert info so that we can look up the signer in the store later */
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
144 if (CryptMsgGetParam(hMsg,
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
145 CMSG_SIGNER_CERT_INFO_PARAM,
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
146 0,
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
147 NULL,
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
148 &dwSignerInfoSize) && dwSignerInfoSize > 0)
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
149 {
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
150 pSignerCert = xmalloc (dwSignerInfoSize);
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
151 }
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
152 else
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
153 {
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
154 ERRORPRINTF ("Failed to get signer cert size.");
586
ecfd77751daf Disambiguate enumerator values and add portable wrapper.
Andre Heinecke <aheinecke@intevation.de>
parents: 579
diff changeset
155 retval = VerifyUnknownError;
579
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
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156 goto done;
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
157 }
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
158
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
159 if (!(CryptMsgGetParam(hMsg,
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
160 CMSG_SIGNER_CERT_INFO_PARAM,
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
161 0,
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
162 pSignerCert,
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
163 &dwSignerInfoSize)))
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
164 {
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
165 ERRORPRINTF ("Failed to get signer cert.");
586
ecfd77751daf Disambiguate enumerator values and add portable wrapper.
Andre Heinecke <aheinecke@intevation.de>
parents: 579
diff changeset
166 retval = VerifyUnknownError;
579
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
167 goto done;
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
168 }
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
169
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
170 pSignerCertContext = CertGetSubjectCertificateFromStore(
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
171 hStore,
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
172 PKCS_7_ASN_ENCODING | X509_ASN_ENCODING,
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
173 pSignerCert);
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
174
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
175 if (!pSignerCertContext)
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
176 {
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
177 ERRORPRINTF ("Failed to find signer cert in store.");
586
ecfd77751daf Disambiguate enumerator values and add portable wrapper.
Andre Heinecke <aheinecke@intevation.de>
parents: 579
diff changeset
178 retval = VerifyUnknownError;
579
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
179 goto done;
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
180 }
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
181
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
182 /* Verify that the signature is actually valid */
629
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
183 if(!CryptMsgControl(hMsg,
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
184 0,
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
185 CMSG_CTRL_VERIFY_SIGNATURE,
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
186 pSignerCertContext->pCertInfo))
579
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
187 {
629
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
188 ERRORPRINTF ("The signature is invalid. \n");
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
189 retval = VerifyInvalidSignature;
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
190 syslog_error_printf ("Software update embedded signature is invalid.");
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
191 goto done;
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
192 }
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
193
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
194 if(check_certificate(pSignerCertContext))
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
195 {
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
196 DEBUGPRINTF ("Valid signature with pinned certificate.");
586
ecfd77751daf Disambiguate enumerator values and add portable wrapper.
Andre Heinecke <aheinecke@intevation.de>
parents: 579
diff changeset
197 retval = VerifyValid;
629
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
198 goto done;
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
199 }
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
200 else
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
201 {
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
202 ERRORPRINTF ("Certificate mismatch. \n");
637
be30d50bc4f0 Add remaining tests to check binverify functionality
Andre Heinecke <andre.heinecke@intevation.de>
parents: 629
diff changeset
203 retval = VerifyInvalidCertificate;
629
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
204 syslog_error_printf ("Software update embedded signature "
facb13c578f1 Add certificate pinning to verify_binary_win
Andre Heinecke <andre.heinecke@intevation.de>
parents: 591
diff changeset
205 "created with wrong certificate.");
579
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
206 goto done;
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
207 }
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
208
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
209 done:
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
210 xfree(filenameW);
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
211 xfree(pSignerCert);
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
212
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
213 if(pSignerCertContext)
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
214 {
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
215 CertFreeCertificateContext(pSignerCertContext);
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
216 }
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
217 if (hStore)
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
218 {
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
219 CertCloseStore(hStore, 0);
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
220 }
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
221 if (hMsg)
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
222 {
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
223 CryptMsgClose(hMsg);
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
224 }
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
225 return retval;
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
226 }
f4ce4eef3b38 Implement PKCS#7 embedded signature verfification for windows
Andre Heinecke <aheinecke@intevation.de>
parents:
diff changeset
227 #endif /* WIN32 */
http://wald.intevation.org/projects/trustbridge/